The utility model relates to an electric test tool of electric power system especially relates to the specialized tool that 500kV circuit breaker routine test worked a telephone switchboard, fastener and clamp including interconnect, set up fastening bolt on the fastener, the fastener passes through fastening bolt to be fixed on the insulator spindle, set up the test hole on the clamp, the test hole is connected with experimental fastener. Connect couple with thorn on the fastener, the both sides of circuit breaker port are connected respectively to couple with thorn. Circuit breaker routine test wiring specialized tool, simple manufacture, the cost is lower, convenient to carry, it is convenient that the installation is dismantled, can reduce the potential safety hazard of using ladder and high altitude construction car to bring among the field test, the material resources of using manpower sparingly improve circuit breaker routine test's operating efficiency.