The invention provides a shaving clamp for an automotive transmission gear, wherein the shaving clamp is easy to operate. The clamp comprises a stepped mandrel, a conical groove is formed in one end of the stepped mandrel, a clamping sleeve is arranged on the stepped mandrel in a sleeving mode, a conical groove is formed in one end of a connecting base, a guide cavity is formed in the connecting base, the other end of the stepped mandrel is matched with a sliding sleeve of the connecting base, and a compressed spring is arranged between the bottom of the guide cavity and the stepped mandrel; a first long-strip-shaped hole is formed in the radial direction of the stepped mandrel, and the hole wall, located on one side of the compressed spring, of the first long-strip-shaped hole is the inclined hole wall; a first through hole and a second through hole are formed in the wall of the guide cavity, a supporting cavity is formed in a supporting base, a third through hole is formed in the bottom of the supporting cavity, the center connecting line of the first through hole, the second through hole and the third through hole is perpendicular to the axial direction of the stepped mandrel, one end of a rod-shaped button is a spherical surface end, the other end of the rod-shaped button is provided with a clamping plate, and the rod-shaped button penetrates through the first through hole, the first long-strip-shaped hole, the second through hole and the third through hole.