The invention discloses a device for preventing misoperation during line maintenance. The device comprises a detecting module, a calibrating module and a judging module. The detecting module is used for detecting connection of lines to determine whether the connection of the lines is normal or not, and the lines can be checked by the detecting module if the connection of the lines is abnormal; the calibrating module is used for detecting the lines by the aid of a line state measuring device when the connection of the lines is normal, and detection results can be outputted by the calibrating module; the judging module is used for detecting the connection of the lines to determine whether the connection of the lines is normal or not if the detection results are not within ranges under preset conditions; closing operation can be carried out on the lines if the detection results are within the ranges under the preset conditions. The device has the advantage that misoperation can be effectively prevented during line maintenance.