The invention relates to a high-voltage insulating ground mat for cable maintenance. A surface layer of the ground mat is a static consumption layer, and a bottom layer of the ground mat is a conductive layer. The ground mat is characterized in that the central part of the ground mat comprises a metal layer; the metal layer comprises a reinforcing block; the metal layer is covered with an insulating layer; the thickness of the reinforcing block is 2mm; the grounding mat is high in strength, is good in insulating effect, and is more suitable for high-voltage occasions.