Perpendicularity calibration device for mounting fabricated building steel structure

The invention discloses a perpendicularity calibration device for mounting a fabricated building steel structure, which comprises a main body arranged close to a steel structure detection surface, and further comprises two groups of guide assemblies arranged on two opposite sides of the main body, each group of guide assembly comprises two swing rods which are oppositely arranged up and down, one end of each swing rod is hinged with the main body, and the other end of each swing rod is hinged with the main body; rail wheels are rotationally arranged at the other ends; the driving assembly is arranged in the main body and used for driving the swing rods to swing so as to adjust the clamping distance formed between the two guide assemblies through the rail wheels. According to the invention, by arranging the swing rods, the track wheels can swing in an arc shape on the main body, and by arranging the driving assembly, the two swing rods included in each guide assembly can swing relatively, so that the clamping