The invention provides a device for mounting and demounting a grounding drill rod. The device comprises a vertical frame; the vertical frame comprises a slide upright column and a supporting upright column; a rack is arranged on the slide upright column in the length direction of the slide upright column; a sliding sleeve capable of sliding up and down along the slide upright column sleeves the slide upright column; a drive box is connected to one side of the sliding sleeve; a drive shaft is arranged in the drive box; a gear engaged with the rack on the slide upright column is arranged on the drive shaft; the input end of the drive shaft extends out of the drive box; an electric pick is connected to the other side of the sliding sleeve; an electric pick drill bit plugging hole is formed under the electric pick; a grounding drill rod fixture is connected to the electric pick drill bit plugging hole. The device is used for mounting and demounting a grounding drill rod by virtue of the vibration of the electric pick; even in hard ground, the grounding drill rod can be mounted and demounted very conveniently; as a result, the operations of mounting and demounting the grounding drill rod are labor-saving and time-saving, and the labor intensity is relatively low and the working efficiency is relatively high.