The invention discloses a transformer substation aluminum bar grounding wire clamp comprising base, a grounding handle of which one end is fixed on the base, and an insulating sheath which sleeves the other end of the grounding handle. The other end of the grounding handle is connected with a grounding rod. The insulating sheath is made of silicone rubber material. The transformer substation aluminum bar grounding wire clamp has the following advantages that the insulation effect is realized by arrangement of the insulating sheath so that electric leakage can be prevented and use safety can be enhanced.