The utility model relates to an arc-shaped support structure. The arc-shaped support structure comprises at least a steel pipe, square woods, an arc-shaped steel pipe, cross bars, a steel pipe inclined strut, a stiff skeleton and a box beam support. The arc-shaped steel pipe is arranged at one end of the whole support structure. The square woods are arranged in the arc-shaped steel pipe, and the square woods are inserted in the arc-shaped steel pipe in a penetrated mode. The cross bars are vertically arranged at the lower end of the arc-shaped steel pipe, and the upper ends of the cross bars are closely connected with the arc-shaped steel pipe. The steel pipe inclined strut is aslant arranged at the right sides of the cross bars, and the upper end of the steel pipe inclined strut is connected with the upper ends of the cross bars. The steel pipe is horizontally arranged at the lower ends of the cross bars, and the upper surface of the steel pipe is connected with the cross bars. The box beam support is arranged below the steel pipe and is vertically arranged. The stiff skeleton is arranged at the right side of the arc-shaped support structure and is parallel to the box beam support. The arc-shaped support structure has the advantages that the structure is attractive and smooth, the bearing capacity is high, the rigidity is large, the support deformation is small, and considerable advantages of improving the intensity and stability of a box beam overall support with a large span and a large section are possessed.