Abstract: With the continuous promotion and popularization of BIM Technology and prefabricated construction, the exploration upsurge of prefabricated construction of electromechanical installation engineering is rising. By studying the application of BIM Technology in assembly electromechanical construction, combined with the special needs of assembly electromechanical module library, and using web development technology and Revit secondary development technology, this paper develops a set of management system suitable for assembly electromechanical module library, which is put into practice in the project. The results show that the system can effectively manage the information and data of assembly electromechanical "family" and "module"; Be able to standardize the management of assembly project modules; Rvt files can be directly downloaded from the cloud library to the project, effectively improving work efficiency.