Swing type piston compressor

The invention relates to a swing type piston compressor. The swing type piston compressor comprises a rack; an air cylinder, a piston rod and a cylindrical valve are installed by the rack; as a piston, one end of the piston rod is inserted into a volume cavity of the air cylinder, and the other end of the piston rod extends out of the rack and is provided with a crankshaft used for being connected with a crank; a through groove is formed in the rack to provide a swing space for the piston rod; the crank drives the piston rod to swing relative to the rack and the piston end face of the piston rod does reciprocating motion relative to the air cylinder; the air cylinder is rigidly connected with a swing column, so that the swing column periodically swings in a same plane while the air cylinder swings, a top column on the swing column slides in a sliding groove of the cylindrical valve, and then the cylindrical valve is driven to rotate in a single direction; and the cylindrical surface of the cylindrical valve i