diff --git a/src/views/MonitorView/MonitorView.vue b/src/views/MonitorView/MonitorView.vue
index 2ea8075..42e2e2e 100644
--- a/src/views/MonitorView/MonitorView.vue
+++ b/src/views/MonitorView/MonitorView.vue
@@ -137,6 +137,7 @@ const {
 })
 
 function onPageHide() {
+  stopDevicePolling()
   disposeLive({ keepalive: true })
 }
 
@@ -146,6 +147,62 @@ const controlExpanded = ref(false)
 const dockStatusOpen = ref(false)
 const selectedDockIds = reactive(new Set())
 
+const DEVICE_POLL_MS = 5000
+let devicePollTimer = null
+let devicePollInflight = null
+let devicePollGen = 0
+let monitorDisposed = false
+
+function clearDevicePollTimer() {
+  window.clearInterval(devicePollTimer)
+  devicePollTimer = null
+}
+
+async function pollDevices({ toastOnSuccess = false } = {}) {
+  if (monitorDisposed) return
+  if (devicePollInflight) return
+  const gen = devicePollGen
+  devicePollInflight = devices.load()
+  try {
+    await devicePollInflight
+    if (monitorDisposed || gen !== devicePollGen) return
+    if (selectedId.value && !devices.record(selectedId.value)) clearSelection()
+    selectedDockIds.forEach((id) => {
+      if (!devices.docks.some((dock) => dock.id === id)) selectedDockIds.delete(id)
+    })
+    syncMarkers()
+    if (toastOnSuccess) ui.toast('设备状态已刷新')
+  } catch (e) {
+    if (monitorDisposed || gen !== devicePollGen) return
+    if (toastOnSuccess) ui.toast(e.message || '刷新设备状态失败')
+    else console.warn('[monitor] device poll failed', e)
+  } finally {
+    devicePollInflight = null
+  }
+}
+
+function startDevicePolling() {
+  clearDevicePollTimer()
+  if (monitorDisposed || document.visibilityState === 'hidden') return
+  devicePollTimer = window.setInterval(() => {
+    void pollDevices()
+  }, DEVICE_POLL_MS)
+}
+
+function stopDevicePolling() {
+  clearDevicePollTimer()
+}
+
+function onDevicePollVisibility() {
+  if (monitorDisposed) return
+  if (document.visibilityState === 'hidden') {
+    stopDevicePolling()
+    return
+  }
+  void pollDevices()
+  startDevicePolling()
+}
+
 let mapInstance = null
 let layersReady = false
 let pendingLoadHandler = null
@@ -660,8 +717,10 @@ function teardownMap() {
 }
 
 onMounted(async () => {
+  monitorDisposed = false
   window.addEventListener('pagehide', onPageHide)
   window.addEventListener('keydown', onGlobalKeydown)
+  document.addEventListener('visibilitychange', onDevicePollVisibility)
   try {
     await devices.load()
     if (route.query.deviceId && devices.record(route.query.deviceId)) selectedId.value = String(route.query.deviceId)
@@ -670,6 +729,7 @@ onMounted(async () => {
   } catch (e) {
     ui.toast(e.message || '加载设备失败')
   }
+  startDevicePolling()
   try {
     await setupMap()
   } catch (e) {
@@ -678,6 +738,10 @@ onMounted(async () => {
 })
 
 onUnmounted(() => {
+  monitorDisposed = true
+  devicePollGen += 1
+  stopDevicePolling()
+  document.removeEventListener('visibilitychange', onDevicePollVisibility)
   window.removeEventListener('pagehide', onPageHide)
   window.removeEventListener('keydown', onGlobalKeydown)
   closeCommandProgress()
@@ -1042,19 +1106,10 @@ function onGlobalKeydown(event) {
 
 
 async function reload() {
-  try {
-    await devices.load()
-    if (selectedId.value && !devices.record(selectedId.value)) clearSelection()
-    selectedDockIds.forEach((id) => {
-      if (!devices.docks.some((dock) => dock.id === id)) selectedDockIds.delete(id)
-    })
-    syncMarkers()
-    if (selectedId.value) flyToSelected()
-    else resetOverviewCamera()
-    ui.toast('设备状态已刷新')
-  } catch (e) {
-    ui.toast(e.message || '刷新设备状态失败')
-  }
+  await pollDevices({ toastOnSuccess: true })
+  if (monitorDisposed) return
+  if (selectedId.value) flyToSelected()
+  else resetOverviewCamera()
 }
 
 const groupedDocks = computed(() =>