Column foot connecting joint of story-added steel column

The utility model discloses a column foot connecting node of a story-adding steel column, which comprises an upper steel pipe column, a column foot bottom plate, a lower base plate, a plate penetrating anchor bolt and an internal reinforcement cage, the upper steel pipe column is filled with concrete after the internal reinforcement cage is installed, the column foot bottom plate is sleeved outside the upper steel pipe column and is attached to the upper surface of a concrete plate, and the lower base plate is sleeved outside the lower steel pipe column. The lower base plate is attached to the lower surface of the concrete plate, the plate penetrating anchor bolt penetrates through the column base bottom plate, the concrete plate and the lower base plate to fixedly connect the column base bottom plate, the concrete plate and the lower base plate, and longitudinal bars of the internal reinforcement cage are anchored into the lower concrete column. According to the column foot connecting joint of the story-adde