Novel high-reliability pneumatic gate valve

The utility model relates to the technical field of pneumatic gate valves, and discloses a high-reliability novel pneumatic gate valve which comprises a protection box, a pneumatic cylinder is fixedly installed in the protection box, and the bottom of the pneumatic cylinder penetrates through the protection box, extends to the outside of the protection box and is fixedly connected with a baffle body. The outer surface of the baffle body is movably connected with a limiting box, and the inner wall of the top of the limiting box is movably connected with the outer surface of the bottom of a pneumatic cylinder in a sleeving mode. Through the arrangement of the circular hole, the driving motor, the rotating rod, the circular shaft and the hollow block, when the driving motor operates, the rotating shaft drives the rotating rod to rotate, then the circular shaft rotates and extrudes to drive the hollow block to move upwards, and when the bottom of the hollow block moves to the position above the circular hole, the