The utility model discloses a nut fastening device, which comprises a rotating handle, an insulated rotating rod and a sleeve, wherein the tail end of the insulated rotating rod is vertically connected with the rotating handle; the top end of the insulated rotating rod is inserted into the side wall of the sleeve; the circumferential surface of the sleeve is provided with a plurality of nut fastening locks. During use, nut fastening work can be realized by adjusting the positions of the nut fastening locks of the same specification till the nut fastening locks and the insulated rotating rod are positioned on the same straight line, and rotating the rotating handle which is arranged vertical to the insulated rotating rod. When nuts of another specification need to be fastened, the positions of the nut fastening locks of a corresponding specification can be adjusted till the nut fastening locks and the insulated rotating rod are positioned on the same straight line, and the rotating handle is rotated to complete fastening work of nuts of a plurality of specifications, so that convenience is brought to carrying.