Electronic fence tension tightener

The utility model discloses a tension tightener for an electronic fence. The device comprises a shell, a rotating screw, a gear, a fixed block, an elastic piece and a bolt, the shell is of a rectangular structure, a rotating screw rod is arranged on the shell in a penetrating mode, a plug pin limiting part is arranged at the tail end of the rotating screw rod, the rotating screw rod is sleeved with a gear, the head of the fixing block makes contact with gear teeth of the gear, the tail end of the fixing block is rotatably arranged on a rotating shaft in a sleeving mode, and the rotating shaftis arranged on the shell. An elastic piece is arranged on the shell below the head of the fixing block; the top of the elastic piece is contacted with the head of the fixing block; a wire hole is formed in the rotating screw, through holes are formed in the positions, corresponding to the wire hole, of the two sides of the shell, and a wire tensioning channel is formed between the through holes and the wire hole. The elec