The invention discloses a grounding knife rod balance mechanism, a grounding knife rod mechanism and a grounding switch. The balance mechanism comprises more than one pair of driving gears, and the tooth surfaces of the two driving gears in the same pair are arranged in a face-to-face or back-to-back manner in the axial direction of a rotating shaft. As the two driving gears in the same pair are arranged in a face-to-face or back-to-back manner, the component forces of the meshing forces borne by the two driving gears in the same pair in the axial direction of the rotating shaft offset each other during back-and-forth pitching and swinging of a grounding knife rod in order to avoid axial endplay of the rotating shaft caused by the component force of meshing transmission force in the axial direction of the rotating shaft. Therefore, the grounding knife rod connected to the rotating shaft does not shift in the axial direction of the rotating shaft, and the reliability of meshing between the driving gears and balance gears is improved. The grounding knife rod balance mechanism of the invention has the advantages of more accurate action of grounding knife rod opening and closing and high stability of meshing transmission.