The utility model provides a self-adaptive near-
electricity voice alarm and a safety helmet, the alarm comprises a master control module, a near-
electricity alarm module and a self-adaptive
voltage detection channel selection module, the master control module and the self-adaptive
voltage detection channel selection module are respectively electrically connected with the near-
electricity alarm module, and the near-electricity alarm module is electrically connected with the self-adaptive
voltage detection channel selection module. The main control module is electrically connected with the adaptive voltage detection channel selection module; the adaptive voltage detection channel selection module comprises a detection matching circuit, a plurality of voltage detection circuits and a gating
control circuit, one end of the detection matching circuit is electrically connected with the near-electricity alarm module, and the other end of the detection matching circuit is electrically connected with the plurality of voltage detection circuits; and the plurality of voltage detection circuits are electrically connected with the gating
control circuit respectively. According to the technical scheme of the utility model, a plurality of different voltage grades can be detected adaptively, and the alarm threshold value can be adjusted automatically and accurately according to the
electric field intensity monitored in real time, so that effective early warning of a multi-stage voltage environment can be realized.