The invention discloses an end grinding device for screw rod machining, and relates to the technical field of screw rod machining. The end grinding device for screw rod machining comprises a base, a horizontal plate is fixedly mounted at the top end of the base through supporting legs, a lifting box is fixedly mounted at the top end of the horizontal plate, and vertical boxes are fixedly mounted on the upper portions of the two sides of the lifting box; a separating plate is fixedly mounted in an inner cavity of the lifting box, a sliding rod is fixedly mounted between the top end of the separating plate and a top plate o the lifting box, and the surface of the sliding rod is slidably connected with a lifting plate; and a first lifting rod is fixedly arranged in the lifting plate, the top end of the first lifting rod penetrates through the top plate of the lifting box and extends above the lifting box, and a first spring is fixedly mounted between the bottom end of the lifting plate and the top end of the separating plate and located on the lifting rod. The side face of a screw rod is clamped by clamping plates through a first cushion plate, the first lifting rod, the lifting plate, clamping rods and other elements, and thus the screw rod can be quickly fixed, time is saved, and work efficiency is improved.