The invention relates to a pressure plate for a compression spring. The compression spring pressure plate comprises a plate body, a positioning groove for positioning and cooperating with a flat cushion in a relief valve spring assembly is arranged on a lower plate surface of the plate body, and a long hole or a through groove which is provided with the positioning groove and is used for supplyinga spring rod and an opening pin in the relief valve spring assembly to pass through the plate body. Compared with the prior art in which two narrow middle wide perforations are arranged on the pressing plate, the pressing plate in the invention can satisfy the smooth passage of the opening pin, and the spring rod can be prevented from moving back and forth along the extending direction of the long hole through the positioning groove and the shim positioning cooperation, so that the pressing plate has wider application range.