The DC line network health management system collects the electrical quantity data of key DC line network equipment such as DC switchgear, DC disconnector, DC feeder cable, internet cable, catenary and negative return rail in real time through various synchronous data acquisition terminals, and uploads them to the cloud in real time. The platform software analyzes and calculates the historical and real-time data of each equipment, node and branch of DC line network, and evaluates the current operation health status and existing safety risk points of each equipment and line of DC line network. The system can replace a large number of manual inspection of DC line network, make up for the blank of safe operation monitoring of equipment in the existing DC line network, improve the operation level of the existing DC line network, and greatly reduce the operation and maintenance cost of metro power supply system. The software system has the characteristics of integrating multiple sub functional modules into one system, convenient operation and clear contrast.