This paper discusses the application of cloud computing technology in the whole process of construction cost management and control. By analyzing the relationship between cloud computing technology and cost management, its role in data storage and management, cost forecasting and contract management, real-time schedule control and data processing is studied. The experimental results show that cloud computing has significant advantages in improving data processing efficiency, reducing resource consumption and optimizing storage space, can effectively improve the precision and efficiency of cost management, and provides efficient tools for large-scale data processing and dynamic management in the construction industry.