The utility model discloses a test electricity and blocking device based on high -tension apparatus leakage current, including setting up sensor on high -tension apparatus, that be used for gathering high -tension apparatus's leakage current signal, link to each other with the sensor, be used for the leakage current signal modulate who gathers the sensor to handle, obtain the voltage signal's that controlling means can discern signal modulation device, link to each other with the signal modulation device, be used for acquireing voltage signal to and judge the formation judged result to voltage signal's size, and send corresponding control signal to alarm device and blocking device respectively according to the judged result, control the controlling means that alarm device and blocking device carry out corresponding action respectively. The device can come to judge high -tension apparatus's the electrified condition according to the size of leakage current signal numerical value, the state of in time instructing high -tension apparatus to reporting to the police and mandatory shutting, providing powerful technique safety measure at the high -tension apparatus state change in -process, the reliability is high.