Positioning device for embedded sleeve in concrete structure

A positioning device for a pre-embedded sleeve in a concrete structure comprises a positioning assembly, the positioning assembly comprises a positioning cover plate, one face of the positioning cover plate is provided with an annular positioning step, the positioning cover plate is used for covering and buckling a top end opening of the pre-embedded sleeve, and the annular positioning step is used for extending into the pre-embedded sleeve; a via hole is also formed in the positioning cover plate; the locking assembly comprises a locking rod, a locking nut and a limiting piece, the locking rod is arranged in the via hole in a penetrating mode, and the limiting piece is arranged at the bottom end of the locking rod; a through hole is formed in a formwork used for forming the concrete structure, the limiting piece is used for penetrating through the through hole and located at the bottom of the formwork, and the limiting piece and the through hole are staggered by rotating the limiting piece; the locking rod i