Gear cutting tools include gear hobbing cutter, gear shaper cutter and gear picking cutter. Due to the high price of gear hobbing cutter, the number of gears that can be processed at one time by hobbing cutter medium is not large, and the problem of production efficiency, the cost of gear processing is high. Through the coating equipment of gear hobbing cutter, the service life of cutter can be extended, the production efficiency can be improved, and the unit cost of gear processing can be reduced 。 The surface of gear hobbing cutter treated by coating equipment of hobbing cutter is higher than that of others. The wear loss of cutting edge front face decreases from 0.3 mm to 0.2 mm, the amount of re grinding decreases, the number of grinding increases, the cutting speed is accelerated, the production efficiency is improved, and the final unit cost of gear machining is greatly reduced