The utility model discloses a shell structure of transformer aims at providing one kind and has high -efficient water -cooling cooling, the quick effectual shell structure of transformer of heat dissipation, has solved the poor problem of shell cooling effect, and its technical scheme main points are casings, be fixed in the radiating block of casing on all around, the radiating block includes the fin of a plurality of equidistant settings, and the bottom of fin is equipped with the baffle of cramming radiating block bottom space, and the outside of baffle is equipped with the seal membrane, and the seal membrane covers in the side of radiating block, be equipped with on the edge of seal membrane to be used for the fixed seal membrane and with the mounting that forms the water storage space between the fin, to have reached high -efficient radiating effect, the utility model is suitable for a transformer equipment technical field.