Tool for loosening screw

The utility model provides a tool for unscrewing a screw, and belongs to the technical field of tools. The problem that rusty screws are inconvenient to disassemble is solved. The device comprises a cylindrical body which is made of metal materials, a mounting hole penetrating through the lower end of the body is formed in the body, a rod-shaped acting piece and a jacking spring with downward elastic force acting on the acting piece are arranged in the mounting hole, a connecting part extending out of the lower end of the body is arranged at the lower end of the acting piece, and a positioning hole communicated with the mounting hole is formed in the side portion of the body. A spiral groove is formed in the outer side of the acting piece, and a steel ball is arranged in the positioning hole and partially located in the spiral groove. The device has the advantages that the dismounting convenience of the rusty screw is improved, the applicability is wide, and the like. 本实用新型提供了松螺丝用的工具，属于工具技术领域。它解决了生锈螺丝拆卸不便的问题。