Reciprocating pump with vacuum-assisted return stroke

The utility model provides a vacuum auxiliary return stroke reciprocating pump which comprises a cylinder body, an annular groove is formed in the cylinder body, a piston is movably connected to the inner side wall of a sealing ring, a vacuum regulator is installed on the side surface of the cylinder body, a circular groove is formed in the bottom of the cylinder body, and a sealing rubber strip is installed in the circular groove. A base is in threaded connection with the interior of the circular groove, the top of the base is attached to the bottom of the sealing rubber strip, circular holes are formed in the base, the number of the circular holes is two, a suction valve and a discharge valve are installed on the outer surfaces of the two circular holes correspondingly, and the suction valve and the discharge valve are symmetrically distributed; a cam is attached to the outer surface of the movable column, a rotating column is fixedly connected to the interior of the cam, and the end, away from the cam, of