High-precision milling cutter

The utility model relates to a high-precision milling cutter. The high-precision milling cutter comprises a tubular cutter handle, a cutter head which penetrates through the cutter handle along the axis of the cutter handle and is in sliding fit with the cutter handle, and a locking piece for fixing the cutter handle and the cutter head, a spiral groove is formed in the peripheral side wall of thetool bit, a plurality of positioning holes are formed in the tool bit in the length direction of the tool bit at intervals, and the positioning holes are formed in the radial direction of the tool bit and penetrate through the tool bit; an inserting hole is formed in the peripheral side wall of the knife handle; the locking piece comprises a locking rod inserted into the insertion hole and one positioning hole, and a clasping ring arranged on the knife handle in a sleeving manner; the clasping ring is an elastic body, and a fracture enabling the clasping ring to be disconnected is formed in the clasping ring. And the