Method for controlling device access, related device and system

The embodiment of the invention discloses a method for controlling device access, a related device and a system. A mobile device obtains first gateway access information of an intelligent device; the mobile device generates a corresponding first wireless fidelity WiFi hotspot according to the first gateway access information; and when the intelligent device accesses the first wireless fidelity WiFi hotspot through the first gateway access information, the mobile device sends second gateway access information to the intelligent device, so that the intelligent device accesses a second wireless fidelity WiFi hotspot. According to the embodiment of the invention, no physical input device needs to be arranged on the intelligent device, thereby reducing the cost of the intelligent device, and on the other hand, the intelligent device is connected with a target gateway according to the second gateway access information sent by the mobile device, so the possibility that the gateway access information is maliciously intercepted is reduced.