Building construction verticality detection device

The utility model relates to the technical field of perpendicularity detection, in particular to a building construction perpendicularity detection device which comprises a U-shaped frame, a base, a fixed seat A, a top plate, a fixed seat B and a height adjusting piece. The base is arranged on the inner side of the opening of the U-shaped frame in a sliding mode, and the lead screw is in driving connection with the base. The fixed seat A is arranged on the base, a telescopic rod A is rotationally arranged on the fixed seat A, and a limiting pin is arranged on the fixed seat A; the top plate is arranged over the base and is parallel to the base, and the top end of the telescopic rod A is rotationally connected with the top plate. The fixed seat B is arranged on the base, a protractor is arranged on the outer end face of the fixed seat B, a rotating shaft rotationally connected with the fixed seat B is arranged on the fixed seat B, and a pointer pointing to scales of the protractor is arranged on the rotating s