Abstract: With the rapid development of China's economy, the scale of construction enterprises is gradually expanding. In the construction process of complex buildings, intelligent weak current system plays a vital role. It can not only meet the diversified needs of building functions, but also achieve the goal of green environmental protection. The construction of weak current system refers to the power supply or functional system with relatively low voltage and current compared with another strong current. This paper mainly analyzes the application of intelligent weak current system in complex buildings, and introduces several key points of specific application and management in detail, so as to provide reference for optimal design in the future.