Prefabricated wall vertical connecting piece

The utility model relates to the technical field of wall body connecting pieces, and discloses a prefabricated wall body vertical connecting piece which comprises a lower wall body and an upper wall body, the right side wall of the lower wall body is fixedly connected with a floor slab, a steel bar is inserted into the lower wall body, the lower side wall of the upper wall body is provided with a grouting groove matched with the steel bar, and the upper side wall of the grouting groove is provided with a placing groove. The upper ends of the steel bars are located in the containing grooves and sleeved with nuts, gaskets arranged outside the steel bars in a sleeving mode are arranged between the nuts and the containing grooves, the containing grooves are filled with concrete blocks, the side walls, located in the lower wall body, of the steel bars are fixedly connected with connecting rods, the left ends of the connecting rods are fixedly connected with containing cylinders, and stabilizing holes are formed in