Concrete arc corner forming device

The utility model relates to the technical field of dies for construction engineering, in particular to a concrete arc corner forming device which comprises a plurality of side plate assemblies, and every two side plate assemblies are connected to form a polygon. The side plate assembly comprises a plurality of unit plates and a plurality of rounded corner forming pieces, clamping grooves are formed in the front side faces of the unit plates, the rounded corner forming pieces are provided with arc faces, and clamping jaws matched with the clamping grooves are arranged on the back faces of thearc faces; avoiding grooves are formed in the edges of the left sides of the unit plates, penetrating holes extending in the vertical direction are formed in the left sides of the unit plates, hinge lugs are arranged on the edges of the right sides of the unit plates, and through holes are formed in the hinge lugs; and the pin shaft is arranged in the through hole and penetrates through the through hole of the unit plate