At present, the intelligent level of building engineering continues to improve. Intelligent building system is compatible with a series of cutting-edge technology forms such as building technology, information technology and so on. Through the cooperation of various technologies, it can realize the collection, analysis, judgment and control of equipment operation information and improve the living quality of buildings. Based on the background of intelligent mechanical and electrical equipment installation in construction engineering, this paper discusses the concrete installation contents, technical key points and optimization measures.