With the development of intelligent substation in China, it becoming more important that the conformance testing of IEC 61850 is used to guarantee the interoperability of intelligent electric device. In view of the current intelligent substation IEC 61850 conformance testing did not form a closed loop, which led to the lacking of comprehensive and integrity, a closed-loop conformance testing system of IEC 61850 was proposed in this paper, both the software and hardware platform were designed to illustrate the implement method of the testing system. Artificial intervention was eliminated by using the automatic judging program, in order to enhance the efficiency and consistency of the testing system. Besides, user-defined calculate example was introduced to form an opened example platform, which can allow users to modify and add the testing example with actual use, to improve the flexibility and offer a reference to related engineering practice.