The utility model discloses a reduce direct current earthing pole step voltage structure, including the earthing pole conductor, there is a ring earthing pole inner ring at the peripheral cover of earthing pole conductor, around being equipped with ring earthing pole outer loop in ring earthing pole inner ring periphery, part in the ring earthing pole between the ring sum ring earthing pole outer loop is equipped with the charcoal bed, lays the insulating layer along the position of ring earthing pole outer loop, the vertical cross -section of insulating layer is U -shaped or L shape. Can reduce more than 10% when adopting step voltage peakedness ratio behind the insulating layer without the insulating layer, the effect is fairly obvious, it is very little to the influence of the performance of earthing pole (like ground resistance, coke surface electric field strength, earthing pole temperature rise etc. ) own to lay the insulating layer, leads to the fact negative effects through the structure of laying insulating layer reduction step voltage hardly to its ground connection performance.