The invention discloses a full-loop alternating-current self-test high-voltage electroscope with a dead zone protection function. The high-voltage electroscope comprises a high-voltage electroscope body and a plurality of sections of telescopic insulation rods, wherein the high-voltage electroscope body comprises a high-voltage electroscope probe, a housing, a full-loop self-test indication lamp, a direct-current power set cabin, a voltage shortage indication lamp, a self-test button switch, a sound-light generator and a full-loop self-test electroscope circuit; a connecting part is arranged at one end of the lower end surface of the housing; the upper end parts of the plurality of telescopic insulation rod are in threaded connection with the connecting part. As a conventional full-loop self-test high-voltage electroscope is improved, the dead zone protection function unconfigured in a general full-loop self-test high-voltage electroscope is configured, and resistors and capacitors of an input loop are matched, the response time of the electroscope in a process of detecting a low voltage is shortened, the sensitivity of the full-loop self-test high-voltage electroscope is improved, and a safety operation can be reliably guaranteed.