The utility model discloses a high voltage live display device through monitoring high -tension apparatus leakage current, high voltage live display device includes the three phase current sensor, the TVS pipe, three -phase amplification and filtering circuit, master control MCU, LED circuit and exclusive circuit, the LED circuit includes LED drive circuit and LED main circuit, the exclusive circuit is including shutting drive circuit, electromagnetic lock main circuit and computer key main circuit, the output of three phase current sensor respectively with the input of TVS pipe, three -phase amplification and filtering circuit's input is connected, three -phase amplification and filtering circuit's output and master control MCU's input are connected, master control MCU's output respectively with LED drive circuit's input, shutting drive circuit's input is connected, LED drive circuit's the output and the input of LED main circuit are connected, shutting drive circuit's output respectively with the input of electromagnetic lock main circuit, the input of computer key main circuit is connected. High -tension apparatus need not have a power failure and just to realize high voltage live display device's installation and maintenance.