Three-section type water stop screw

The utility model relates to the technical field of water stop screw rods, in particular to a three-section type water stop screw rod which comprises a first screw rod, the three-section type water stop screw rod is installed on the inner wall of a pull rod hole after concrete is poured, a positioning steel sheet is welded to the fixed position of a second screw rod, and a plastic plug made of PVC materials is additionally arranged. The control over the distance between the inner formwork and the outer formwork can be effectively improved, the plastic plugs can effectively plug holes, the wall body appearance flatness and the linear and square steel sheet water stop pieces serve as water stop structures and are used for preventing water from permeating along screw holes, the three-section type water stop screw is adopted for replacing an old-fashioned pull rod inserting technology, and the water stop effect is good. The appearance linetype of the wall body is improved, and meanwhile, the water permeation resi