High-voltage live-line display device

A high-voltage live-line display device disclosed by the present invention comprises a voltage sensor arranged at the near side of a high-voltage bus and a leakage current sensor arranged at a lightning arrester leakage current leading-out port, a voltage transformer senses a certain voltage from a high-voltage live-line loop as a displaying and locking power supply via a capacitive sensing module, and the leakage current sensor acquires a line-side lightning arrester leakage current. The voltage transformer and the leakage current sensor supplies power to a mainboard via the or gate acquisition and are connected with the mainboard, and the mainboard is connected with an indicating lamp. According to the present invention, by the or gate acquisition of the voltage transformer and the leakage current sensor, when one signal determines that a line is electrified, the mainboard determines that the line is electrified, only when the two signals both determine that the line is not electrified, the mainboard determ