For the serious function failure and precision loss of YX3120 gear hobbing machines with the growing service time in gear manufacturing companies， repair and remanufacturing solution of YX3120 gear hobbing machine is proposed. The processes of YX3120 gear hobbing machine remanufacturing are designed， including disassembly， clean， inspection and sorting， part reconditioning， reassembly and test. Especially， the repair and remanufacturing scheme of bed， table， large column， small column and knife rest are analyzed. Finally， the result shows that the function and performance of remanufactured YX3120 can reach the factory standard of new ones， with great economic and social benefits.