Through the research of 3D laser scanning control network, the point cloud data collection and the point cloud data processing, this paper compares and verifies the real-time point cloud model with the construction BIM model, develops a prefabricated building intelligent construction and installation system based on BIM and IoT. It also establishes a demonstration project pilot to take the actual project application results as feedback which will optimize the existing management methods and construction technology, reduce the installation deviation and improve the quality of engineering.