The invention belongs to the field of communication, and provides a method and a device for controlling the opening and closing of a dynamic frequency selection function. The method comprises the following steps: receiving located country information of a mobile terminal reported by the mobile terminal; judging whether the located country information is located in a preset country information set; if the judgment result is negative, sending a dynamic frequency selection function closing instruction to the mobile terminal to close the dynamic frequency selection function; if the judgment result is positive, sending a dynamic frequency selection function opening function to the mobile terminal to open the dynamic frequency selection function; and the preset country refers to a country having overlapped communication frequency band and limiting frequency band of a wireless local area network communication device. According to the method provided by the embodiments of the invention, whether the located country information of the mobile terminal is located in the preset country information set is judged to control the automatic opening and closing of the dynamic frequency selection function, and a user is avoided manually opening and closing the dynamic frequency selection function, thereby reducing the operation steps of the user and improving the user experience.