Diamond polishing grinding tool

The utility model discloses a diamond polishing grinding tool which comprises a combined disc and a grinding disc. The grinding disc capable of grinding the bottom face and the side face is arranged and comprises the base disc, the grinding ring, the grinding assembly and the side face grinding piece, when the grinding disc rotates at a high speed, the bottom end of the grinding disc or the side face of the grinding disc can be used for grinding and polishing the grinding piece, and the grinding disc can adapt to grinding pieces of more specifications without replacing the grinding disc; the combined disc capable of being connected with the grinding disc in a combined mode is arranged, a clamping groove formed by an auxiliary ring and a disc body fixing outer ring is matched with a limiting ring for limiting, a limiting block is limited through a limiting clamping groove supported by a supporting plate, and rapid connection and fixation of the combined disc and the grinding disc are achieved; the advantages o