As accelerators increase in scale and complexity, their control networks face challenges such as device proliferation, security management difficulties, and low maintenance efficiency. To address these issues, a control network management system for large-scale accelerators was designed and developed. This system implements three functions: centralized management of control network IP addresses, automated collection of dynamic network information, and network access control. The system prevents IP conflicts through a centralized application and approval mechanism, enables real-time monitoring of device status and precise physical location identification based on switch operational data, and enhances control network access security through IP and port binding. The system is built on a web. architecture, with a front-end developed using the Vue.js framework and a back-end utilizing a hybrid technology stack of Node.js and Python, while MongoDB is employed for data storage. This system has been successfully deployed and is operating stably in the China Spallation Neutron Source (CSNS) accelerator control network, effectively addressing security vulnerabilities and maintenance challenges in network management. It has also established a foundation for network management in CSNS-II.