High-pressure gas-sealed lift valve

The invention discloses a high-pressure gas-sealed lift valve. The high-pressure gas-sealed lift valve comprises two valve plate units which are arranged in a valve body and separated through a partition plate. Each valve plate unit comprises a circular valve plate arranged in the valve body, a valve rod of which the upper end is fixed to the center of the valve plate, and an air cylinder which isfixed to the lower side surface of the valve body and connected with the lower end of the valve rod. A circular gas storage outer ring and a gas storage inner ring are formed in the peripheral positions, corresponding to the valve plates, of the upper side surface of the valve body and form a gas storage ring. A side valve plate of the valve body is provided with a high pressure gas port communicating with the gas storage ring. According to the high-pressure gas-sealed lift valve, the gas storage ring formed by the gas storage outer ring and the groove inner ring is formed in the valve body,sealing can be achieved by injecting high-pressure gas, thus, the sealing performance of the valve plate is greatly improved when the valve plate is closed, the phenomenon that untreated exhaust gas leaks is avoided, meanwhile, a sealing device is arranged between the lower end of the valve rod and the valve body, and the sealing effect is further improved.