The invention relates to live-line-work mistakenly-touch prevention equipment and especially relates to an electricity-inspection mistakenly-touch prevention alarm device and a method. A technical scheme is characterized in that the device comprises a fixing seat, a solar cell panel, a lead fixing ring, a height adjuster, a radar detector and a sound alarm; a side surface of the fixing seat is used to fix the solar cell panel; an upper portion of the fixing seat is used to fix the height adjuster; a top of the height adjuster is used to fix the lead fixing ring; the radar detector is arranged in an internal portion of the lead fixing ring; the radar detector is connected to a control chip; and the solar cell panel is connected to a storage battery. The device and the method of the invention have advantages that the structure is simple; usage is convenient; a work effect is effectively increased; generation of accidents during working is reduced and normal electric power supply is guaranteed.