diff --git a/backend/app/tasks/celery_app.py b/backend/app/tasks/celery_app.py
index c0e7350..aa03af4 100644
--- a/backend/app/tasks/celery_app.py
+++ b/backend/app/tasks/celery_app.py
@@ -32,6 +32,7 @@ scan_single_ip_task = _tasks['scan_single_ip_task']
 full_network_scan = _tasks['full_network_scan']
 update_all_statistics = _tasks['update_all_statistics']
 quick_status_update = _tasks['quick_status_update']
+poll_snmp_devices = _tasks['poll_snmp_devices']
 
 # 定时任务配置
 celery_app.conf.beat_schedule = {
@@ -52,4 +53,9 @@ celery_app.conf.beat_schedule = {
         'task': 'app.tasks.scan_tasks.update_all_statistics',
         'schedule': 900.0,  # 15分钟
     },
+    # 每60秒检查一次 SNMP 设备轮询（各设备按自己的 poll_interval 判断是否到期）
+    'poll-snmp-devices-every-60s': {
+        'task': 'app.tasks.scan_tasks.poll_snmp_devices',
+        'schedule': 60.0,
+    },
 }
diff --git a/backend/app/tasks/scan_tasks.py b/backend/app/tasks/scan_tasks.py
index ae2f273..12c67cc 100644
--- a/backend/app/tasks/scan_tasks.py
+++ b/backend/app/tasks/scan_tasks.py
@@ -212,11 +212,75 @@ def register_tasks(celery_app):
         finally:
             db.close()
 
+    @celery_app.task(bind=True)
+    def poll_snmp_devices(self):
+        """
+        定时任务：自动轮询所有活跃且配置了 SNMP 凭据的网络设备。
+
+        每个设备按自己的 arp/mac/interface_poll_interval（秒）判断是否到达
+        轮询间隔，到期才执行 SNMPService.poll_device（采集 ARP 表、MAC 地址
+        表、接口信息）。由 Celery Beat 每 60 秒触发一次检查。
+        """
+        import asyncio
+        from datetime import datetime
+
+        from app.models.snmp import NetworkDevice
+        from app.services.snmp_service import SNMPService
+
+        db = SessionLocal()
+        try:
+            devices = db.query(NetworkDevice).filter(
+                NetworkDevice.is_active == True,
+                NetworkDevice.snmp_credential_id.isnot(None),
+            ).all()
+
+            now = datetime.utcnow()
+
+            def _as_naive(dt):
+                """把 aware/naive datetime 统一转 naive（本地比较用）"""
+                if dt is None:
+                    return None
+                if dt.tzinfo is not None:
+                    return dt.replace(tzinfo=None)
+                return dt
+
+            polled, skipped = 0, 0
+            for dev in devices:
+                # 取三种采集间隔的最小值作为该设备的轮询周期
+                intervals = [
+                    dev.arp_poll_interval,
+                    dev.mac_poll_interval,
+                    dev.interface_poll_interval,
+                ]
+                interval = min([i for i in intervals if i], default=300)
+
+                last = _as_naive(dev.last_polled_at)
+                if last is not None:
+                    elapsed = (now - last).total_seconds()
+                    if elapsed < interval:
+                        skipped += 1
+                        continue
+
+                try:
+                    # poll_device 是 async 函数，用 asyncio.run 在同步任务中执行
+                    asyncio.run(SNMPService.poll_device(db, dev.id))
+                    polled += 1
+                    logger.info(f"SNMP 自动轮询完成: {dev.name} ({dev.ip_address})")
+                except Exception as e:
+                    logger.error(f"SNMP 自动轮询失败 {dev.name} ({dev.ip_address}): {e}", exc_info=True)
+
+            logger.info(f"SNMP 自动轮询检查完成: 设备总数 {len(devices)}, 本轮轮询 {polled}, 未到期跳过 {skipped}")
+            return {'status': 'completed', 'total': len(devices), 'polled': polled, 'skipped': skipped}
+        finally:
+            db.close()
+
     # 返回任务函数供外部使用
     return {
         'scan_network_task': scan_network_task,
         'scan_single_ip_task': scan_single_ip_task,
         'full_network_scan': full_network_scan,
         'update_all_statistics': update_all_statistics,
-        'quick_status_update': quick_status_update
+        'quick_status_update': quick_status_update,
+        'poll_snmp_devices': poll_snmp_devices,
     }
+