The invention discloses an electronic fence alarm system. The system comprises a plurality of stainless steel wire ropes, a plurality of wire rope fixing devices, a plurality of high-strength insulating ceramic terminals, a plurality of tension detection devices, a main tension control board and a high-voltage generating device, wherein, the plurality of the stainless steel wire ropes are sequentially and alternately arranged from the top down and are connected in series through high-voltage leads; the plurality of the wire rope fixing devices are respectively connected on two ends of each stainless steel wire rope; two ends of each wire rope are respectively and sequentially connected with one wire rope fixing device and one high-strength insulating ceramic terminal, the high-strength insulating ceramic terminal on one end is arranged on a support bar, and the high-strength insulating ceramic terminal on the other end is connected with one tension detection device; the tension detection devices are fixedly arranged on the other support bar and are connected with the main tension control board; and the main tension control board is connected with the high-voltage generating device, is used for receiving and processing a tension signal, and controls the high-voltage generating device to generate high-voltage pulse in case of an alarm. The electronic fence alarm system has an active defense function without blind spots in perimeter precaution; and the system is adapted to various complex terrain environments without precaution dead space, thus being widely applicable to all places in need of perimeter precaution.