Piston ring of air compressor and air compressor

The utility model provides a piston ring of an air compressor and the air compressor and relates to the field of air compressors, the piston ring comprises a limiting block, an upper ring body and a lower ring body, the bottom of the upper ring body is fixedly connected to the top of the lower ring body, the top of the limiting block is fixedly connected to the bottom of the upper ring body, and control grooves are formed in the two ends of the lower ring body. A control groove is formed in the piston rod, one side of the control groove is fixedly connected with a control device, the air compressor comprises a machine body and a piston, the outer side of the piston is movably connected to the side wall of an inner cavity of the machine body, a clamping block is arranged on the piston, and a through groove allowing the limiting rod to movably penetrate is formed in the clamping block. The fixed end of the driving part is fixedly connected to the side wall of the inner cavity of the control groove, the output e