diff --git a/miniprogram/lefu/service.ts b/miniprogram/lefu/service.ts
index 22b123e..9fd902a 100644
--- a/miniprogram/lefu/service.ts
+++ b/miniprogram/lefu/service.ts
@@ -68,6 +68,8 @@ class LeFuService {
 	get BLUE_STATE(): Record<string, string> { return plugin.BLUE_STATE ?? {} }
 	/** 设备固件信息 */
 	get deviceInfo(): DeviceInfo | null { return this._deviceInfo }
+	/** 最近一次连接/扫描到的原始设备 */
+	get lastRawDevice(): RawDevice | null { return this._lastRawDevice }
 
 	// ─── 事件回调注册（均返回反注册函数） ───────
 	/** 订阅「扫描结果列表」事件 */
diff --git a/miniprogram/pages/connectedDevice/connectedDevice.ts b/miniprogram/pages/connectedDevice/connectedDevice.ts
index 7e61360..4676215 100644
--- a/miniprogram/pages/connectedDevice/connectedDevice.ts
+++ b/miniprogram/pages/connectedDevice/connectedDevice.ts
@@ -1,6 +1,12 @@
 import { leFuService } from '../../lefu/index'
 import type { ScannedDevice } from '../../lefu/index'
 import type { RawDevice } from '../../lefu/types'
+import { post } from '../../utils/request/index'
+import type { UserInfo } from '../../api/index'
+
+/** 绑定设备 SN 到用户信息 */
+const bindDevice = (data: { sn: string; idCard: string; connectDeviceInfo?: string }) =>
+    post('weighingScale/v6/bindDevice', data, { loading: false })
 
 /** 渲染用的设备项（RawDevice 含复杂对象，不进 setData） */
 interface DeviceItem {
@@ -17,6 +23,7 @@ let scannedDevices: ScannedDevice[] = []
 let unsubDevicesList: (() => void) | null = null
 let unsubDisconnected: (() => void) | null = null
 let unsubDeviceConnect: (() => void) | null = null
+let unsubDeviceInfo: (() => void) | null = null
 /** 连接流程的清理句柄 */
 let connectCleanup: {
     timer: number | null
@@ -34,6 +41,8 @@ Page({
     },
 
     onShow() {
+        // 订阅设备信息，连接后拿到 SN 绑定到用户
+        this._subscribeDeviceInfo()
         // 从其他页面返回时同步连接状态
         if (leFuService.isConnected) {
             this._markConnected()
@@ -51,6 +60,8 @@ Page({
     },
 
     onUnload() {
+        unsubDeviceInfo?.()
+        unsubDeviceInfo = null
         leFuService.stopScan()
         this._clearSubscriptions()
         this._clearConnectCleanup()
@@ -91,6 +102,31 @@ Page({
         wx.openAppAuthorizeSetting()
     },
 
+    /** 订阅设备固件信息，拿到 SN 后绑定到当前用户 */
+    _subscribeDeviceInfo() {
+        unsubDeviceInfo?.()
+        unsubDeviceInfo = leFuService.onDeviceInfo((info) => {
+            const sn = info?.serialNumber
+            if (!sn) return
+            this._bindDevice(sn)
+        })
+    },
+
+    /** 调用接口把设备 SN 绑定到已保存的用户信息 */
+    _bindDevice(sn: string) {
+        const userInfo = wx.getStorageSync('userInfo') as UserInfo | null
+        const idCard = userInfo?.idCard
+        if (!idCard) return
+        const connectDeviceInfo = leFuService.lastRawDevice ? JSON.stringify(leFuService.lastRawDevice) : ''
+        bindDevice({ sn, idCard, connectDeviceInfo })
+            .then((res) => {
+                console.log('[connectedDevice] bindDevice 成功:', res)
+            })
+            .catch((err) => {
+                console.error('[connectedDevice] bindDevice 失败:', err)
+            })
+    },
+
     /** 将所有卡片置为未连接 */
     _markAllDisconnected() {
         this.setData({