A gas compressor is a kind of volumetric compressor with a special structure. It is the highest level compression method in the field of gas compression. This compression method has no secondary pollution, has very good protection for the compressed gas, and has the characteristics of a large compression ratio, good sealing performance, and the compressed gas is not polluted by lubricating oil and other solid impurities. It is suitable for compressing gases of high purity, rare and precious, flammable and explosive, toxic and harmful, corrosive and high pressure.