Because it is of difficulty and low efficiency in the smart high-voltage equipment system joint testing at present, an implementation of system-level distributed test cases for smart high-voltage equipment is presented. By the unified modeling technology for smart high-voltage equipment system-level test, generating total test cases to ensure the correctness and coordination of testing behavior and testing timing under various working conditions. According to characteristic elements of role definition, the same role sequence state is extracted from the total test cases, and its sub-test cases are recombined by executive order. The testing devices perform their test cases respectively, achieving working condition simulating, information collection and analysis in the testing process automatically by information exchange, completing function verification and performance testing for the testing device. The corresponding smart high-voltage equipment test system is designed and developed, the result of testing and field operation shows that the system has reliability, stable performance and high application value. This work is supported by Major Science and Technology Specialized Fund of State Grid Corporation of China “Reliabillty Research on Smart Substation by and Intelligent Component”.