Gas emergency cut-off valve

The utility model discloses a gas emergency cut-off valve, including emergency cut-off valve body, mounting plate, motor, first helical tooth, second helical tooth, screw rod, fixed plate and abutting plate, mounting plate is fixed connection in the bottom of emergency cut-off valve body, motor is fixed connection in the both sides of fixed plate inner wall bottom, screw rod, fixed plate and abutting plate. The first helical teeth are fixedly connected to the side opposite to the motor, the second helical teeth are connected to the bottoms of the first helical teeth in a meshed mode, the screws are fixedly connected to the interiors of the second helical teeth, the tops and the bottoms of the screws are movably connected with the tops and the bottoms of the inner walls of the fixing plates, and the fixing plates are connected to the tops of the surfaces of the screws in a threaded mode. The gas emergency cut-off valve solves the problems that an existing gas emergency cut-off valve in the market is always in