The invention relates to the technical field of a pump. The pump is characterized in that correcting planes and matched correcting planes are arranged on the surface of the inner diameter of a cylinder body and the surface of the outer diameter of a piston; a fitting operation process is performed between the two combination planes in the operation of the pump; an end cover is provided with a radial matched seal surface which fits and seals the two axial ends of the cylinder body and the piston; the axial position of a sliding vane general groove extends to the opening of the end cover from a sliding vane sliding groove in the cylinder body or the piston; a fragmented sliding vane group which is decomposed into a left part and a right part is tightly fitted with the two side faces of the sliding vane general groove on the left and right; the operating end face of the sliding vane group is fitted with the correcting plane of the cylinder body or the matched correcting plane of the piston or slides in a fitting manner; an air discharge valve piece is arranged on the correcting plane or the matched correcting plane; and the radial matched seal surface of the end cover or the opening side face of the end cover is used as a valve seat of the air discharge valve piece. The sliding vane pump has the advantages of long service life, strong operating ability, low limit pressure, great compression ratio, high efficiency, low noise, small volume and the like, and the pump manufacturing and processing technique is simple.