The utility model discloses a single -column double -bus is ladder arrangement structure back -to -back. The utility model discloses a technical scheme do: single -column double -bus is ladder arrangement structure back -to -back, including horizontal steel pipe buttress, bus bar and the main bus -bar that the perpendicular steel pipe pole that sets up, level set up, its characterized in that, theboth sides of perpendicular steel pipe pole adopt mode back -to -back to set up three -layer horizontal steel pipe buttress different in size to the post insulators of generating line is do not set up at horizontal steel pipe buttress tip, post insulators be horizontal ladder and arrange, bus bar arrange through the post insulators ladder that the opposite side at the steel pipe pole is arrangedthrough the post insulators ladder to the main bus -bar in one side of steel pipe pole. The utility model discloses with the generating line of generating line optimization for descending the ladder to arrange in going up back -to -back that conventional level was arranged, the adjacent alternate condition emergence that leads to the line -to -line short -circuit at sleet weather because of the water column has been avoided under arranging perpendicularly.