The utility model discloses a live working earth potential safe distance warning device, the device main part of making including insulating material, the bottom of device main part is equipped with safe distance warning bottom surface, the left and right sides of device main part is connected with adjustable length and according to adjusting the insulation ropes that safe distance is confirmed to back length, insulation ropes's upper end is equipped with the auto -lock couple that is articulated to on the electrified conducting wire of operation post top, the device main part is including controlling parallel main part arc roof beam and connecting the insulation horizontal rod between two main part arc roof beams, safe distance warning bottom surface be with the tangent arc beam of main part arc roof beam. The utility model discloses play the effect of safe distance warning, operator person can directly perceivedly see the device, and the position of device bottom surface is the safe distance under this electric pressure promptly, as long as operator person no longer than the device bottom surface, can keep safe distance promptly, does not take place the electric shock accidents, guarantees operation safety and goes on.