Building embedded sleeve installation device

The utility model relates to the technical field of casing pipe installation, in particular to a building casing pipe installation device which comprises a positioning assembly and a fixing assembly, the positioning assembly is placed in a casing pipe, the positioning assembly is composed of a steel pipe and a metal rod piece, the steel pipe is perpendicular, the metal rod piece is horizontally welded to the bottom end of the steel pipe along the pipe wall, and the metal rod piece is of a radial structure; the fixing assembly is composed of a lower positioning piece, a harness cord screw, an upper positioning piece with a hole and a bolt, the bottom end of the harness cord screw is perpendicularly welded to the lower positioning piece, the harness cord screw penetrates through the steel pipe of the positioning assembly and the upper positioning piece with the hole, the edge of the upper positioning piece with the hole completely covers the top face of the sleeve, and the bolt is arranged on the harness cord s