diff --git a/frontend/src/layouts/MainLayout.vue b/frontend/src/layouts/MainLayout.vue
index 67cf9590..fbc6be2e 100644
--- a/frontend/src/layouts/MainLayout.vue
+++ b/frontend/src/layouts/MainLayout.vue
@@ -28,6 +28,9 @@
           <span class="page-title">{{ pageTitle }}</span>
         </div>
         <div class="header-right">
+          <el-select v-model="currentEntityId" @change="onEntityChange" size="small" style="width:120px;margin-right:8px;">
+            <el-option v-for="e in entities" :key="e.id" :label="e.short_name || e.name" :value="e.id" />
+          </el-select>
           <el-tag size="small" :type="roleTagType">{{ roleLabel }}</el-tag>
           <el-dropdown trigger="click">
             <span class="user-info"><el-icon><User /></el-icon>{{ userName }}</span>
@@ -43,8 +46,9 @@
 </template>
 
 <script setup lang="ts">
-import { ref, computed } from 'vue'
+import { ref, computed, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
+import api from '../api/index'
 import {
   User, Monitor, Document, TrendCharts, WarningFilled, Connection,
   Menu, Bell, Setting, Coin, DataAnalysis, Money, DataLine,
@@ -57,6 +61,25 @@ const router = useRouter()
 const isCollapse = ref(false)
 const mobileMenuOpen = ref(false)
 
+// ── 全局企业切换 ──
+const entities = ref<any[]>([])
+const currentEntityId = ref(Number(localStorage.getItem('cma_entity_id') || 1))
+const currentEntityName = ref(localStorage.getItem('cma_entity_name') || '酣客')
+function onEntityChange(id: number) {
+  currentEntityId.value = id
+  const e = entities.value.find((x: any) => x.id === id)
+  currentEntityName.value = e?.short_name || e?.name || ''
+  localStorage.setItem('cma_entity_id', String(id))
+  localStorage.setItem('cma_entity_name', currentEntityName.value)
+  location.reload()
+}
+onMounted(async () => {
+  try {
+    const r: any = await api.get('/entities')
+    entities.value = r.data || r || []
+  } catch (_) {}
+})
+
 // 图标名称 → 组件实例映射
 const iconMap: Record<string, any> = {
   Monitor, Document, TrendCharts, WarningFilled, Connection,