Abstract: Objective: It is aimed to tackle the issues of low information reliability, poor traceability, personnel management difficulty, and low operational efficiency in the current SEC (signaling equipment construction) work procedures. Method: By analyzing the SEC workflow and considering the design requirements of SEC work quality supervision system, the system architecture is researched from three aspects: network security architecture, technical architecture, and system modules. The security domains of network security architecture are divided into production execution, production support, management, and wireless domains, and security measures are implemented in each domain. The technical architecture adopts a distributed architecture design, comprising the perception layer, middleware layer, data service layer, and application layer to achieve high system availability and concurrency, enhancing the system data processing capacity and efficiency. In terms of system module design, each procedure of the SEC work is elaborately classified, including the work order management module, supervision logic analysis module, image acquisition module, image analysis module, and personnel performance evaluation module, ensuring effective supervision and management at every SEC procedure. Result & Conclusion: Through application validation in onsite production environment, the SEC work quality supervision system proves to effectively improve SEC work quality and efficiency, while reducing safety risks and regulatory costs, standardizing SEC procedures, and providing solid assurance for operational safety.