Abstract: In response to the problems of insufficient integration of multidimensional information, lack of consideration for temporal dynamic collaboration, and weak ability to decouple cross disciplinary conflicts in existing collision detection methods for building electromechanical pipelines, a comprehensive research on building electromechanical pipeline collision detection based on 4D-BIM model is carried out. By introducing a time dimension and coupling construction sequence logic, a four-dimensional building information model covering geometric, process, and schedule information was constructed, achieving full cycle, multi-disciplinary collision simulation and collaborative optimization of the electromechanical pipeline system in a virtual construction environment. Comparative experiments show that this method exhibits significant improvements in conflict recognition integrity, coordination efficiency, and construction feasibility compared to existing collision detection methods. It provides a highly applicable digital collaborative management solution for complex electromechanical integration projects such as the demolition and reconstruction of drainage stations.