Air valve pressurizing sealing device

The utility model discloses an air valve pressurizing sealing device which is characterized in that the air valve pressurizing sealing device comprises a sealing cover, a connecting flange is arranged on the periphery of the sealing cover, a plurality of through holes are evenly distributed in the connecting flange, connecting bolts penetrate through the through holes to be correspondingly connected with a port of an air valve, and a sealing gasket is arranged between contact surfaces of the connecting flange and the port of the air valve. A pressurizing opening, a pressure relief opening and a high-precision pressure gauge are arranged on the sealing cover; a pressurizing valve is connected in series with the pressurizing opening through a pipeline to be connected with an air source; the pressure relief opening is connected with a pressure relief valve in series through a pipeline; and the high-precision pressure gauge is connected into the sealing cover through a gas pipeline. The whole device is fixed to t