diff --git a/viewshanghai-module-iot/viewshanghai-module-iot-biz/src/main/java/com/viewshanghai/module/iot/api/device/IoTDeviceApiImpl.java b/viewshanghai-module-iot/viewshanghai-module-iot-biz/src/main/java/com/viewshanghai/module/iot/api/device/IoTDeviceApiImpl.java
index 1cbec9f..c1fed62 100644
--- a/viewshanghai-module-iot/viewshanghai-module-iot-biz/src/main/java/com/viewshanghai/module/iot/api/device/IoTDeviceApiImpl.java
+++ b/viewshanghai-module-iot/viewshanghai-module-iot-biz/src/main/java/com/viewshanghai/module/iot/api/device/IoTDeviceApiImpl.java
@@ -47,8 +47,22 @@ public class IoTDeviceApiImpl implements IotDeviceCommonApi {
     @PostMapping(RpcConstants.RPC_API_PREFIX + "/iot/device/get") // 特殊：方便调用，暂时使用 POST，实际更推荐 GET
     @PermitAll
     public CommonResult<IotDeviceRespDTO> getDevice(@RequestBody IotDeviceGetReqDTO getReqDTO) {
-        IotDeviceDO device = getReqDTO.getId() != null ? deviceService.getDeviceFromCache(getReqDTO.getId())
-                : deviceService.getDeviceFromCache(getReqDTO.getProductKey(), getReqDTO.getDeviceName());
+        IotDeviceDO device;
+        
+        // 查询优先级：id > (productKey + deviceName) > deviceName
+        if (getReqDTO.getId() != null) {
+            // 通过设备 ID 查询
+            device = deviceService.getDeviceFromCache(getReqDTO.getId());
+        } else if (getReqDTO.getProductKey() != null && getReqDTO.getDeviceName() != null) {
+            // 通过 productKey + deviceName 查询
+            device = deviceService.getDeviceFromCache(getReqDTO.getProductKey(), getReqDTO.getDeviceName());
+        } else if (getReqDTO.getDeviceName() != null) {
+            // 仅通过 deviceName 查询（用于 JT808 等协议，终端手机号应该是全局唯一的）
+            device = deviceService.getDeviceFromCacheByDeviceName(getReqDTO.getDeviceName());
+        } else {
+            device = null;
+        }
+        
         return success(BeanUtils.toBean(device, IotDeviceRespDTO.class, deviceDTO -> {
             IotProductDO product = productService.getProductFromCache(deviceDTO.getProductId());
             if (product != null) {
diff --git a/viewshanghai-module-iot/viewshanghai-module-iot-biz/src/main/java/com/viewshanghai/module/iot/service/device/IotDeviceService.java b/viewshanghai-module-iot/viewshanghai-module-iot-biz/src/main/java/com/viewshanghai/module/iot/service/device/IotDeviceService.java
index 2fde82a..3f35e0f 100644
--- a/viewshanghai-module-iot/viewshanghai-module-iot-biz/src/main/java/com/viewshanghai/module/iot/service/device/IotDeviceService.java
+++ b/viewshanghai-module-iot/viewshanghai-module-iot-biz/src/main/java/com/viewshanghai/module/iot/service/device/IotDeviceService.java
@@ -131,6 +131,19 @@ public interface IotDeviceService {
      */
     IotDeviceDO getDeviceFromCache(String productKey, String deviceName);
 
+    /**
+     * 【缓存】根据设备名称获得设备信息（仅通过设备名称查询）
+     * <p>
+     * 注意：该方法会忽略租户信息，所以调用时，需要确认会不会有跨租户访问的风险！！！
+     * <p>
+     * 此方法主要用于 JT808 等协议，设备在注册时只知道终端手机号（deviceName），
+     * 不知道 productKey。对于 JT808 协议，终端手机号应该是全局唯一的。
+     *
+     * @param deviceName 设备名称（如 JT808 的终端手机号）
+     * @return 设备信息，未找到返回 null
+     */
+    IotDeviceDO getDeviceFromCacheByDeviceName(String deviceName);
+
     /**
      * 获得设备分页
      *
diff --git a/viewshanghai-module-iot/viewshanghai-module-iot-biz/src/main/java/com/viewshanghai/module/iot/service/device/IotDeviceServiceImpl.java b/viewshanghai-module-iot/viewshanghai-module-iot-biz/src/main/java/com/viewshanghai/module/iot/service/device/IotDeviceServiceImpl.java
index df1157f..5c00ca8 100644
--- a/viewshanghai-module-iot/viewshanghai-module-iot-biz/src/main/java/com/viewshanghai/module/iot/service/device/IotDeviceServiceImpl.java
+++ b/viewshanghai-module-iot/viewshanghai-module-iot-biz/src/main/java/com/viewshanghai/module/iot/service/device/IotDeviceServiceImpl.java
@@ -259,6 +259,13 @@ public class IotDeviceServiceImpl implements IotDeviceService {
         return deviceMapper.selectByProductKeyAndDeviceName(productKey, deviceName);
     }
 
+    @Override
+    @Cacheable(value = RedisKeyConstants.DEVICE, key = "'deviceName_' + #deviceName", unless = "#result == null")
+    @TenantIgnore // 忽略租户信息，用于 JT808 等协议，终端手机号应该是全局唯一的
+    public IotDeviceDO getDeviceFromCacheByDeviceName(String deviceName) {
+        return deviceMapper.selectByDeviceName(deviceName);
+    }
+
     @Override
     public PageResult<IotDeviceDO> getDevicePage(IotDevicePageReqVO pageReqVO) {
         return deviceMapper.selectPage(pageReqVO);