Method and device for device accessing to network

The invention discloses a method and device for a device accessing to a network. The method includes the following steps: a first device receives a first message which is used for indicating that a controller which constructs and sends the first message is capable to provides a reachable path of a network address allocation server; the first device sends a first request message to the controller according to the first message, wherein the first request message is used for requesting the controller and/or the path-reachable network address allocation server controlled by the controller to allocate a network address for the first device; and the first device is accessed to a network according to the allocated network address. The method in the invention solves the technical problems in related technology that network addresses of devices in a system is preconfigured, so devices without configured network addresses cannot be effectively accessed to a network, and deployment of the network and data forwarding are relatively low in flexibility, and a technical effect that a device can be effectively accessed to a network without setting a control plane network is achieved.