Abstract: This paper designed a railway internal audit operation quality management and control platform to address problems such as relatively weak project management and process control in the execution of railway internal audit projects, as well as incomplete and inadequately objective quantitative standards for audit quality evaluation. The paper described the platform’s architecture and core functions. By integrating key technologies such as blockchain based evidence storage, Transformer based text analysis, and abnormal behavior detection, it implemented full lifecycle quality management and control over audit projects within the railway audit management information system. The paper constructed a closed loop model covering the entire audit process of “planning–preparation–implementation–conclusion–rectification,” implemented elastic resource dispatching and microservice governance through a three layer technical architecture, and integrated multi source business data such as material and financial data via a data middle platform to build audit models for areas including financial revenue and expenditure and engineering construction. Practical application shows that the platform can effectively improve the standardization of project management and the efficiency of audit governance, and provide a reference for the digital transformation of railway internal audit.