The invention relates to a tool special for V-shaped cushion ring groove machining. The tool special for V-shaped cushion ring groove machining comprises a tool body. The tool body is provided with achanneling cutter base. The channeling cutter base is fixedly provided with channeling cutter heads with V-shaped head parts. The tool body is provided with a fine adjusting mechanism used for adjusting the channeling cutter base. The fine adjusting mechanism comprises a fine adjusting core shaft and a transmission mechanism. The transmission mechanism is connected between the channeling cutter base and the fine adjusting core shaft, and the fine adjusting core shaft is provided with an adjusting mechanism. The tool is provided with the channeling cutter heads with the V-shaped head parts, therate of machining cushion ring grooves is increased, the machining efficiency is improved, and the machining time is shortened; and the tool body is provided with the fine adjusting mechanism for adjusting the channeling cutter base, then, the distance between the channeling cutter heads arranged on the cutter base is adjusted, the tool can machine different sizes of workpieces to be machined, the machining precision of the cushion ring grooves can be effectively guaranteed, the using requirements of a user are met, the yield of a cushion ring is guaranteed, the waste of materials is reduced,the manufacturing cost is reduced for an enterprise, and the development of the enterprise is facilitated.