An embodiment of this application discloses a device management method. A first network management device may obtain subscription parameter information, where the subscription parameter information is used to indicate a subscription parameter used during a process of establishing a first subscription session, and the first subscription session is used to indicate a first network device to send subscription data to a network management device managing the first network device. After the first network management device determines that the first subscription session is interrupted, the first network management device may generate a request message based on the subscription parameter information, and send the request message to a network device managed by the first network management device.