The utility model discloses a fully automatic electronic rat killer, relating to an electronic rat killer which can be widely used for a family, a hotel, a warehouse, a cultivation farm, a paddy field, or other rat proofing devices. The utility model comprises a casing and a face plate, wherein, the face plate is provided with an indicating lamp, a switch, and a rat killing output line. The utility model is characterized in that the inner part of the casing is provided with a special type isolation transformer, an electronic circuit is composed of a fully automatic protecting module IC, a power amplification circuit, a reverse voltage protection circuit (a charging circuit), a quick charging circuit, a three directional indicating circuit, an operating indicating circuit, an ac current limiting protection circuit, an acoustic alarm BC, and a fully automatic or continuous switch.