Wall surface perpendicularity detector for building construction

The utility model relates to the technical field of buildings, in particular to a wall perpendicularity detector for building construction, which comprises a fixing frame, sliding arc frames are fixedly arranged at the front end and the right end of the fixing frame, a vertical line is connected onto the fixing frame, the vertical line extends downwards to be fixedly provided with a vertical block, a protective cylinder is fixedly arranged at the upper end of the vertical block, and a hinge block is fixedly arranged on the periphery of the protective cylinder. Telescopic rods are connected to the ends, close to the two sliding arc frames, of the hinge blocks, sliding cavities are formed in the two sliding arc frames, scale marks are arranged on the upper side walls of the two sliding cavities, arc-shaped sliding blocks are fixedly arranged at the ends, close to the sliding cavities, of the two telescopic rods, and rolling wheels are rotationally connected to the upper side walls and the lower side walls of th