diff --git a/demo/App.vue b/demo/App.vue
index c749cb9..5f257a1 100644
--- a/demo/App.vue
+++ b/demo/App.vue
@@ -41,6 +41,7 @@ const toolbarConfig = {
   showTimeScale: true, // 控制日|周|月时间刻度按钮组的可见性
   timeScaleDimensions: ['week', 'month', 'quarter', 'year'], // 设置时间刻度按钮的展示维度，包含所有时间维度
   defaultTimeScale: 'week',
+  showExpandCollapse: true, // 显示全部展开/折叠按钮
 }
 
 // TaskList列配置
diff --git a/src/components/GanttChart.vue b/src/components/GanttChart.vue
index 72e725e..182da43 100644
--- a/src/components/GanttChart.vue
+++ b/src/components/GanttChart.vue
@@ -37,6 +37,8 @@ const props = withDefaults(defineProps<Props>(), {
   onLanguageChange: undefined,
   onThemeChange: undefined,
   onFullscreenChange: undefined,
+  onExpandAll: undefined,
+  onCollapseAll: undefined,
   localeMessages: undefined,
   workingHours: () => ({
     morning: { start: 8, end: 11 },
@@ -96,6 +98,8 @@ interface Props {
   onLanguageChange?: (lang: 'zh-CN' | 'en-US') => void
   onThemeChange?: (isDark: boolean) => void
   onFullscreenChange?: (isFullscreen: boolean) => void
+  onExpandAll?: () => void
+  onCollapseAll?: () => void
   /**
    * 自定义多语言（国际化）配置，结构参考内置 messages['zh-CN']，只需传递需要覆盖的 key 即可。
    * 例如：
@@ -346,6 +350,52 @@ const handleTaskCollapseChange = (task: Task) => {
   updateTaskTrigger.value++
 }
 
+// 全部展开任务
+const handleExpandAll = () => {
+  if (props.onExpandAll && typeof props.onExpandAll === 'function') {
+    props.onExpandAll()
+  } else {
+    // 默认行为：递归展开所有任务
+    const expandAllTasks = (tasks: Task[]): void => {
+      tasks.forEach(task => {
+        if (task.children && task.children.length > 0) {
+          task.collapsed = false
+          expandAllTasks(task.children)
+        }
+      })
+    }
+
+    if (props.tasks) {
+      expandAllTasks(props.tasks)
+      // 触发Timeline重新计算
+      updateTaskTrigger.value++
+    }
+  }
+}
+
+// 全部折叠任务
+const handleCollapseAll = () => {
+  if (props.onCollapseAll && typeof props.onCollapseAll === 'function') {
+    props.onCollapseAll()
+  } else {
+    // 默认行为：递归折叠所有任务
+    const collapseAllTasks = (tasks: Task[]): void => {
+      tasks.forEach(task => {
+        if (task.children && task.children.length > 0) {
+          task.collapsed = true
+          collapseAllTasks(task.children)
+        }
+      })
+    }
+
+    if (props.tasks) {
+      collapseAllTasks(props.tasks)
+      // 触发Timeline重新计算
+      updateTaskTrigger.value++
+    }
+  }
+}
+
 // 用于强制触发Timeline重新计算的响应式值
 const updateTaskTrigger = ref(0)
 
@@ -1528,7 +1578,11 @@ function handleTaskDelete(task: Task, deleteChildren?: boolean) {
       :on-theme-change="props.onThemeChange"
       :on-fullscreen-change="props.onFullscreenChange"
       :on-time-scale-change="handleTimeScaleChange"
+      :on-expand-all="handleExpandAll"
+      :on-collapse-all="handleCollapseAll"
       @add-task="handleToolbarAddTask"
+      @expand-all="handleExpandAll"
+      @collapse-all="handleCollapseAll"
     />
 
     <!-- 甘特图主体 -->
diff --git a/src/components/GanttToolbar.vue b/src/components/GanttToolbar.vue
index ada324a..313f0aa 100644
--- a/src/components/GanttToolbar.vue
+++ b/src/components/GanttToolbar.vue
@@ -20,6 +20,8 @@ const props = withDefaults(defineProps<Props>(), {
   onFullscreenChange: undefined,
   onSettingsConfirm: undefined,
   onTimeScaleChange: undefined,
+  onExpandAll: undefined,
+  onCollapseAll: undefined,
 })
 
 const emit = defineEmits<{
@@ -32,6 +34,8 @@ const emit = defineEmits<{
   'theme-change': [isDark: boolean]
   'fullscreen-change': [isFullscreen: boolean]
   'time-scale-change': [scale: TimelineScale]
+  'expand-all': []
+  'collapse-all': []
 }>()
 
 // LocalStorage keys
@@ -56,6 +60,8 @@ interface Props {
   onThemeChange?: (isDark: boolean) => void
   onFullscreenChange?: (isFullscreen: boolean) => void
   onTimeScaleChange?: (scale: TimelineScale) => void
+  onExpandAll?: () => void
+  onCollapseAll?: () => void
   // 外部确认接口
   onSettingsConfirm?: (
     type: 'theme' | 'language',
@@ -140,6 +146,23 @@ const handleExportPdf = () => {
   }
 }
 
+// 展开/折叠处理函数
+const handleExpandAll = () => {
+  if (props.onExpandAll && typeof props.onExpandAll === 'function') {
+    props.onExpandAll()
+  } else {
+    emit('expand-all')
+  }
+}
+
+const handleCollapseAll = () => {
+  if (props.onCollapseAll && typeof props.onCollapseAll === 'function') {
+    props.onCollapseAll()
+  } else {
+    emit('collapse-all')
+  }
+}
+
 // 语言下拉菜单控制
 const toggleLanguageDropdown = () => {
   showLanguageDropdown.value = !showLanguageDropdown.value
@@ -461,6 +484,45 @@ onUnmounted(() => {
         </button>
       </div>
 
+      <!-- 展开/折叠按钮组 -->
+      <div
+        v-if="config.showExpandCollapse !== false"
+        class="btn-group expand-collapse-btn-group"
+      >
+        <button
+          class="btn-group-item"
+          :title="t('expandAll')"
+          @click="handleExpandAll"
+        >
+          <svg
+            class="btn-icon"
+            viewBox="0 0 24 24"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+          >
+            <polyline points="6 9 12 15 18 9"></polyline>
+          </svg>
+          {{ t('expandAll') }}
+        </button>
+        <button
+          class="btn-group-item"
+          :title="t('collapseAll')"
+          @click="handleCollapseAll"
+        >
+          <svg
+            class="btn-icon"
+            viewBox="0 0 24 24"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+          >
+            <polyline points="18 15 12 9 6 15"></polyline>
+          </svg>
+          {{ t('collapseAll') }}
+        </button>
+      </div>
+
       <!-- 导出按钮组 -->
       <div
         v-if="config.showExportCsv !== false || config.showExportPdf !== false"
diff --git a/src/composables/useI18n.ts b/src/composables/useI18n.ts
index f1c175c..f4a1015 100644
--- a/src/composables/useI18n.ts
+++ b/src/composables/useI18n.ts
@@ -84,6 +84,8 @@ const messages = {
     todayLocateTooltip: '定位到今天',
     exportCsv: '导出 CSV',
     exportPdf: '导出 PDF',
+    expandAll: '全部展开',
+    collapseAll: '全部折叠',
     language: '中文',
     languageTooltip: '选择语言',
     lightMode: '明亮模式',
@@ -276,6 +278,8 @@ const messages = {
     todayLocateTooltip: 'Locate to today',
     exportCsv: 'Export CSV',
     exportPdf: 'Export PDF',
+    expandAll: 'Expand All',
+    collapseAll: 'Collapse All',
     language: 'English',
     languageTooltip: 'Select language',
     lightMode: 'Light Mode',
diff --git a/src/models/configs/ToolbarConfig.ts b/src/models/configs/ToolbarConfig.ts
index 6e34e54..211fe2f 100644
--- a/src/models/configs/ToolbarConfig.ts
+++ b/src/models/configs/ToolbarConfig.ts
@@ -13,4 +13,5 @@ export interface ToolbarConfig {
   showTimeScale?: boolean // 显示时间刻度按钮组
   timeScaleDimensions?: TimelineScale[] // 设置时间刻度按钮的展示维度
   defaultTimeScale?: TimelineScale // 默认选中的时间刻度
+  showExpandCollapse?: boolean // 显示全部展开/折叠按钮
 }