Perpendicularity detection device capable of being used for building construction

The utility model discloses a verticality detection device capable of being used for building construction, which comprises a plumb aligner body, a mounting seat and an objective lens, and further comprises a dust shielding mechanism formed by a threaded wall, a threaded ring, a gland, a soft plug, a lifting handle, a conical-bucket-shaped rubber cover, a thick round rubber sleeve and a counterweight ring, the bottom end of the plumb aligner body is provided with the mounting seat, and the surface of the mounting seat is provided with a locking bolt. An objective lens is installed at the top end of the plumb aligner body, a threaded wall used for installing a threaded ring in a screwed mode is turned on the shell wall of the objective lens, a dust shielding mechanism is arranged on the plumb aligner body serving as the building construction perpendicularity detection device, and the dust shielding mechanism can shield dust when the plumb aligner body is installed outside the calibrated and installed plumb ali