The invention relates to a method for live removal of a fault low-voltage lightning arrester, and belongs to the field of lightning arresters. The tail end of a double-ended operating rod extends intoa field cabinet through a mounting hole in the bottom of a cabinet body; the head of a fixing screw is embedded in a second concave hole in the tail end of the double-ended operating rod; the fixingscrew is rotated out of a screw hole in a horizontal edge of an L-shaped strip grounding pole; the head end of the double-ended operating rod extends into the field cabinet through the mounting hole in the bottom of the cabinet body; a low-voltage lightning arrester body is held in the first concave hole in the head end of the double-ended operating rod; and the double-ended operating rod can be rotated to rotate the low-voltage lightning arrester body out of an internal thread fixing hole under an operating knife switch. The original transverse working mode of removing the lightning arresterfrom the front side of the field cabinet is changed to the vertical working mode of removing the low-voltage lightning arrester from the bottom of a mounting cabinet, so that live removal of the low-voltage lightning arrester is realized, and field rapid maintenance and replacement of the low-voltage lightning arrester by maintenance personnel are facilitated greatly.