The invention particularly relates to a caliper piston and a manufacturing process thereof, and belongs to the technical field of automobile accessories. An inner hole is formed in one end of the piston. A round groove is formed in the end surface of the other end of the piston and located in the center. A circle of annular teeth are arranged on the end port of the round groove. The end surface, where the annular teeth are located, of the round groove is provided with two notch grooves communicating with the round groove. A circle of trough is formed in the outer circle of the piston. An air leakage hole is formed in the radial direction of the trough and communicates with the inner hole. The surface of the piston is plated with a layer of chromium. The production of the piston is completed through the steps of receiving inspection, blank making, cold extrusion, drilling, rough turning of the inner hole, fine turning of the outline, tooth pressing, fine turning of the inner hole, drilling of a small hole, grinding, electroplating, polishing, finished product inspection, packing and storage. The production efficiency is improved, and the accuracy and quality of products are strictlycontrolled.