Detachable locking pin screw

The utility model provides a detachable locking pin screw which is arranged in a lower layer of poured concrete in a detachable mode. The detachable locking pin screw comprises an external screw, an internal screw and nuts connecting the external screw and the internal screw. The nuts are horn-shaped, a horn port of each nut abuts against a mould, the external screw stretches into the nut from the external side of the mould, the internal screw is arranged on the inner side of the internal screw, and is screwed into the nuts through an opposite side of the horn port of the nut. According to the detachable locking pin screw, due to the fact that the external screw is screwed into the nuts to be used as a locking pin screw, after the external screw is used and the mould is disassembled, the internal screw is enabled to be separated from the nuts by twisting the external screw to disassemble the nuts and the external screw. The detachable locking pin screw can be used repeatedly, and overcome the defect that a lo