The invention relates to a method for balancing a metal surface electrical field of electrical insulation equipment. According to the method, a conductive coating layer is arranged between a metal surface of the electrical insulation equipment and an insulation layer; the conductive coating layer is prepared by two or more types of liquid metals. The method is advantaged in that electrical field distortion caused by surface defects of the metal materials can be balanced, charge aggregation at the defect portion can be reduced, electrical field and partial discharge at the defect portion can be effectively reduced, and damage to the insulation material caused by the overhigh partial electrical field can be prevented.