This paper aimds at improving the degree of automatic test of relay protection device further. It is based on the research of existing automatic test system of the relay protection device. It starts from the actual demand and R & D test principle. This paper designs a general automatic test system which can simultaneously support multiple relay protection devices. The maximum of the system has the advantages of existing automatic test system, using distributed architecture and module design idea, makse full use of the existing computer software and network technology, realizing multiple closed-loop automatic test device. Practice has proved that, the system used in the relay protection equipment R & D in the test, can greatly improve the testing efficiency and testing, to ensure the reliability of the device.