The invention discloses a switch cabinet with a voltage equalizing device, including cabinet, the right side surface of the cabinet body is provided with a control switch group, the input terminal ofthe control switch group is electrically connected with the output terminal of the external power supply, a cabinet door is hinged at the open end of the front side of the cabinet body, A left side surface and a right side surface of that cabinet body are provided with ventilation grooves, a dust-proof net is arranged in the ventilation groove, a heating dehumidification device is arranged at theinner bottom end of the cabinet body, two symmetrically distributed insulating plates are vertically arranged inside the cabinet body, through holes are arranged on the side surfaces of the insulatingplates, and the side surfaces of the two insulating plates are fixed with bus bars by bolts and nuts. The switch cabinet with the voltage equalizing device has the advantages of safety in use, excellent performance, increased ventilation and heat dissipation capacity in the cabinet body, and timely heat dissipation, is capable of removing moisture in the cabinet body, avoiding damages of components in the cabinet body caused by humidity in rainy or cloudy days, avoiding bolt tip discharge in the overlap position of the bus bar in the cabinet body, optimizing electric field, and avoiding electric arc generation.