Shaft hobbing clamp

The utility model discloses a shaft hobbing clamp which comprises a first center structure and a second center structure coaxial with the first center structure, the second center structure comprisesa body and a center body installed in the body, a through hole is formed in the axial direction of the body, and an expansion sleeve is movably arranged in the through hole in the length direction ofthe through hole. One end of the expansion sleeve extends out of the body, and a blind hole is formed in the other end of the expansion sleeve in the axial direction of the expansion sleeve. An elastic piece and a centre body are mounted in the blind hole; one end of the elastic piece is connected with the inner end face of the blind hole, and the other end of the elastic piece is connected with the centre body. The body, the centre body, the expansion sleeve, the blind hole and the through hole are coaxially arranged; the shaft hobbing clamp provided by the utility model realizes a floating centering function to axial