The invention discloses a device for controlling air treatment equipment. Each of the air treatment equipment comprises an air inlet, an air outlet and an air channel connected with the air inlet and the air outlet. A function module is arranged in each air channel. The device comprises a Widget interface and is bound with the multiple pieces of air treatment equipment. The device comprises a determination module, an acquiring module and a processing module. The determination module is used for determining the first air treatment equipment corresponding to a command when the air treatment equipment switching command triggered based on the Widget interface is received. The acquiring module is used for acquiring the name and operation information of the first air treatment equipment. The processing module is used for updating the name and operation information, currently displayed on the Widget interface, of the second air treatment equipment into the name and operation information of the first air treatment equipment. The invention further discloses a method and system for controlling the air treatment equipment. By means of the device, method and system for controlling the air treatment equipment, control convenience of the air treatment equipment is improved.