Shaft gear fixture and shaft gear machining tool

The invention relates to a shaft gear fixture which is suitable for fixed positioning of shaft gear workpieces. The shaft gear fixture comprises a base, a driving disk and an elastic propping piece, wherein a first through hole is formed in the base; the driving disk is detachably connected onto the base, comprises a driving end surface far away from the base and is provided with a second through hole coaxially aligned to the first through hole; the elastic propping piece is telescopically arranged in the first through hole and the second through hole in the axis direction of the first through hole and comprises a propping tip exposed out of the second through hole. By the aid of the shaft gear fixture, the shaft gear machining precision can be improved, and journals of the shaft gear workpieces can be prevented from being scratched. The invention further relates to a shaft gear machining tool provided with the shaft gear fixture.