The application relates to the technical field of size
measuring equipment, and discloses a prefabricated building accessory size calibration device which comprises a rack and further comprises a calibration table, a calibration ruler, a screening mechanism, a positioning mechanism and a
cutting mechanism. The calibration table is slidably arranged in the rack, the calibration table is provided with a moving mechanism, the calibration ruler is arranged on the rack, the calibration table is provided with an indicating arrow, the screening mechanism is arranged on the rack, the screening mechanism comprises a screening plate, the screening plate is rotationally arranged in the rack, a pressing plate is slidably arranged on the screening plate, the positioning mechanism is arranged on the rack, the positioning mechanism comprises a positioning block, the positioning block is arranged on the rack, and the
cutting mechanism is arranged on the rack. Through the technical scheme, the problem that the accuracy of measuring the steel structure by an operator holding a
tape measure is poor, and it is not easy to complete the
assembly construction of the steel structure in some high-precision building positions with a little deviation is solved.