Auxiliary engineering actual measurement method based on BIM model and AR system

The invention provides an auxiliary engineering actual measurement method based on a BIM model and an AR system. The method comprises the steps that the BIM model is established through BIM software; the BIM model cooperates with the AR system; scanning a real scene through an AR system, and aligning and superposing the BIM model and the real scene through a reference point; the AR system generates a 3D graph 1.0 after the BIM model and the real scene are superposed; actual quantity data needing to be actually measured are collected and calibrated through an AR system, and the AR system is calibrated; the AR system generates a 3D graph 2.0 after the BIM model and the real scene are superposed; and the AR system exports, transmits or stores the 3D graph 2.0 and the collected data. The steps can be completed by the same worker, manpower is saved, the same worker is responsible from beginning to end, the degree of understanding the project is high, operation is skilled, time and labor are saved, the AR system is