The invention relates to a method, a device and a system for processing terminal positioning and a router. The method comprises the steps of monitoring a mobile terminal Mac address broadcasted by a mobile terminal, sending a router Mac address to an auxiliary positioning server, receiving corresponding router location information returned by the auxiliary positioning server according to the router Mac address, sending the mobile terminal Mac address, the name of the router and the router location information to a cloud server so as to serve as positioning information of the mobile terminal. Positioning for the terminal can be realized more simply through the router by applying the scheme provided by the embodiment of the invention.