The invention discloses an electric grounding device. The electric grounding device comprises a base provided with a walking mechanism, a transmission shaft, a ratchet wheel, a supporting frame arranged on the base and a pawl installed on the supporting frame; the transmission shaft is connected with the supporting frame through a base sleeve, the ratchet wheel is movably connected with the transmission shaft, a limiting structure and a friction assembly are arranged on the transmission shaft, a rope winding roller is arranged at one end of the transmission shaft, a fixed pulley for a rope to penetrating through is arranged on a cross arm of the supporting frame, a balancing weight is arranged at the free end of the rope on the rope winding roller, and a grounding column guide sleeve movably connected with the base is arranged at one side of the base. By means of the device, the grounding column can be accurately installed, installing time is short, installing efficiency is high, and the device is convenient to operate, safe and reliable.