The invention relates to the field of heat-dissipating structures, in particular to a multifunctional heat-dissipating structure for radioactive substance transportation containers. The heat-dissipating structure comprises a plurality of fins which are connected with the outer surface of a container. Each fin comprises a fin head and a fin body, the fin body is firmly connected with the fin head, and the fin head is higher than the upper surface of the container. The fin head is provided with an extended block along the direction of the center of the container, and the bottom of the extended block is welded on the upper surface of the container. The top of the fin head is stepped and declined from the periphery to the center, and the outer top is cambered. The heat-dissipating structure has the advantages that: each fin is made of stainless steel, has a simple shape, and is easy to machine; the fins are welded on the container, and are evenly distributed along the outer wall of the container to form wing-shaped structures, thus the heat transfer area of the container is enlarged, air flow passages are formed between the wing-shaped structures to accelerate the flow of the air, and thereby the heat-dissipating effect is enhanced; and the annular upper surface formed by the tops of the fin heads can cushion top impact load, and the wing-shaped structures of the fins can cushion side impact.