The invention discloses a piston for a refrigerator compressor. The piston comprises a piston body. A fixed groove is formed in the piston body. A movable column is movably arranged in the fixed groove and extends to the exterior of the fixed groove. An extruding column is arranged at the top end of the movable column and arranged outside the piston body. Reset springs are arranged between the piston body and the extruding column. First placing cavities are formed in the side, close to the piston body, of the extruding column, and second placing cavities are formed in the side, close to the extruding column, of the piston body. One ends of the reset springs extend into the first placing cavities, and the other ends of the reset springs extend into the second placing cavities. The structures of the first placing cavity and the structures of the second placing cavities are same. The structure is simple, operation is convenient, the borne impact force of the piston can be buffered, meanwhile, the reset springs can be replaced rapidly, the using cost of people is reduced, and the using requirement of the people is met.