Disclosed in the utility model is a full-voltage full-loop self-checking capacitive type electroscope comprising an electroscope circuit box body, an insulated operation rod, and a handle. A detection probe and a display screen are arranged at the electroscope circuit box body; and the electroscope circuit box body includes a microcontroller module and a self-checking circuit module. A voltage level conversion circuit box body and a voice broadcasting module are arranged in the electroscope circuit box body; the input terminal of the voltage level conversion circuit box body is connected with the detection probe and the output terminal is connected with the microcontroller module; the input terminal of the voltage level conversion circuit box body is connected with the self-checking circuit module by the detection probe; and the voice broadcasting module is connected with the microcontroller module. According to the technical scheme, full-voltage switching of the electroscope can be realized. Meanwhile, the self-checking function can be realized and the voltage class selected by the operator also can be broadcasted and the operator is prompted to carry out secondary confirmation, thereby effectively avoiding an accident caused by electroscope operation due to selection of an unmatched voltage class by the operator.