High-voltage electroscope adjustable in length

The invention discloses a high-voltage electroscope adjustable in length. The electroscope comprises a handle, an insulated section and an electroscope head, wherein the insulated section is positioned between the handle and the electroscope head; a retractable section is also arranged between the insulated section and the handle and comprises a fixed shell section body and a movable shell sectionmodule consisting of a plurality of movable shell section bodies; the movable shell section module is embedded in the fixed shell section slidably, the electroscope head is arranged on the movable shell section module, a main spring is arranged in a cavity of the retractable section, the two ends of the main spring abut against the end part of the fixed shell section body and the movable shell section module respectively, and the retractable section is provided with a pushing lock capable of preventing the movable shell section module from extending. According to the electroscope, the whole length of the high-voltage