Relay protection devices show an explosive growth trend. There are some problems in the traditional method of relay protection test. For example, it cannot carry out the inspection work on time, and requires huge human resources and economic costs, etc. To solve the above problems, a safe and efficient relay protection remote power-on test system is designed. Based on the existing relay protection system of a substation, the system is realized using the power-on transmission function of relay protection, and expanding the intelligent operation and maintenance business of the substation. The system fully considers the security of relay protection remote power-on test, and designs three-level multiple security error prevention of relay protection, with an intelligent recorder and master station. To achieve an efficient intelligent test, the system designs such core functions as monitoring and warning of the trip and close circuits, monitoring and warning of mechanical characteristics of switches, and integration of master and slave stations. Given the principle, application and effect of engineering application, the system can change the traditional manual power-off test mode of relay protection, and has practical value and engineering prospect.