Abstract: With the expansion of the construction scale and management requirements of high-speed railway projects, the number of business application systems is also increasing, and the business data is scattered, which makes it difficult to give full play to the intrinsic value of data. Digital middle-platform technology provides a new idea for the business integration and data resource convergence of high-speed railway quality management. This paper proposed a high-speed railway project quality management system architecture based on the digital middle-platform, gave the design idea of the digital middle-platform, expounded the role of the digital middle-platform in the high-speed railway project quality management system, as well as the challenges faced by the proposed system in the application process. It provides a reference for the digital transformation of high-speed railway project quality management.