Sealing device of pneumatic valve

The utility model provides a sealing device of a pneumatic valve, which belongs to the technical field of pneumatic valves, and comprises a valve body, a valve rod, a plugging block and a valve core piece, a first flow channel and a second flow channel are arranged in the valve body, and the valve core piece is arranged between the first flow channel and the second flow channel; the valve element piece is provided with a communicating hole, the first flow channel and the second flow channel are communicated through the communicating hole, the plugging block is arranged in the valve body in a vertical sliding mode along the valve element piece, and the valve rod is fixedly connected with the plugging block. The valve element piece is arranged between the two flow channels in the valve body, the communicating hole is formed in the valve element piece, meanwhile, the blocking block moves up and down along the valve element piece to control whether the communicating hole is blocked or not, opening and closing are