An auxiliary tool specially used for ground wire installation comprises a hollow insulation rod. A fixing card is installed horizontally on the top portion of the insulation rod. The fixing card is a card, of which the front end is an annular groove. The central section of the fixing card is in hinged connection with the central section of a movable plate. One end of the movable plate is matched with a clamping groove of the fixing card. The end, matched with the fixing card, of the movable plate is connected to a first spring. The other end of the first spring is connected with a tail end of the fixing card. The other end of the movable plate is connected with one end of a stay wire. One end of the stay wire passes through the internal portion of the insulation rod, and the other end of the stay wire is connected with a ratchet bar. The ratchet bar is installed in the lower portion in the insulation rod. The lower portion of the insulation rod is provided a vertical through groove. A tooth surface of the ratchet bar is oriented towards the through groove. The periphery of the through groove is provided with a housing, and the housing is in hinged connection with a stir sheet. A hinged connection portion of the stir sheet is provided with a torsion spring. An end portion of the stir sheet is in cooperation with the ratchet bar. A stir rod is installed on the stir sheet. A limiting apparatus is horizontally arranged on the insulation rod on the upper portion of the through groove.