The invention belongs to the field of electric switches, and particularly discloses an air-insulated double-power supply ring main unit. The air-insulated double-power supply ring main unit comprises a cabinet body, a controller, an air-insulated double-power supply switch and a double-power supply quick operating mechanism, wherein the controller is arranged at the top of the cabinet body; the air-insulated double-power supply switch and the double-power supply quick operating mechanism are arranged in the cabinet body; an outlet pile head which is connected with an outlet cabinet body is arranged at the upper part of the air-insulated double-power supply switch; an inlet pile head which is connected with an inlet cable is arranged at the lower part; the air-insulated double-power supply switch is mechanically connected with the cabinet body and the double-power supply quick operating mechanism through flange plates respectively; and the double-power supply quick operating mechanism is mechanically connected with a seal plate in the cabinet body. According to the air-insulated double-power supply ring main unit, integration of a plurality of functions of switching, opening, closing, overhauling and the like of power supplies is achieved; the usage quantities of switches and switch cabinets are reduced; and the cost is effectively reduced.