Downhole double-air-door locking device

The utility model relates to the technical field of underground ventilation safety, and discloses an underground double-air-door locking device which comprises a wall body and a stand column and further comprises a guide pipe arranged on one side of the stand column and an installation piece arranged on the outer side of the guide pipe. The steel wire rope is arranged in the guide pipe, and a reset spring and a limiting piece for limiting the reset spring are arranged in the guide pipe; the double-air-door locking device comprises a wall body, a guide piece arranged on one side of the wall body, and a first air door and a second air door which are both mounted in the wall body, and solves the problems that a double-air-door locking device in the current market generally adopts a sensor and an electric control hydraulic mechanism to control the air doors, the fault rate is high in an underground complex operation environment, the purchase and maintenance cost of each device is high, and the service life is sho