Abstract: The effective integration of smart technology and building technology has resulted in smart buildings. Today, with the in-depth development of smart technology, more and more smart buildings have appeared on the market. Many of the functions of these smart buildings are intelligent. Features. However, smart buildings have high technical requirements and greater engineering investment. In the construction of smart buildings, engineering companies should actively carry out cost management throughout the life cycle to improve the comprehensive benefits of smart buildings. Based on this, this article analyzes in detail the strategy of cost management for the entire life cycle of smart buildings, which is benefi cial to fundamentally improve the cost control level of smart buildings.