The utility model relates to a double-power automatic-switch smart gas control system applied in mines. The system is provided with two cavity bodies, each with a control box therein, a wiring cavity at the upper section and a filter unit at the lower section. The filter unit is arranged with a cascading bus panel. A rectifier unit and an inverter unit are fixed on the substrate of a heat-dissipater of a heat tube. The rectifier unit, the inverter unit and the filter unit are connected via the cascading bus panel. The inverter unit is connected with a driving circuit. A double-switch unit is connected with a control circuit. An electric current sensor unit and a transformer unit are arranged on the side walls of each cavity. A display unit and a button unit are arranged on the front door of each cavity. A discharge resistance unit is arranged between the filter unit and the front door. A triggering unit is arranged on the flameproof surface of the rectifier unit. A charging resistance is arranged on the flameproof surface inside each cavity. The utility model can automatically switch power between two fans rapidly.