This utility model discloses a steel drum shaping device, relating to the technical field of shaping devices. The utility model includes a Y-shaped support block, on which an extension mechanism and a lifting mechanism are provided. The extension mechanism includes an installation groove formed within the Y-shaped support block, with a plurality of connecting rods slidably connected to the inner wall of the installation groove. The sides of the connecting rods, which are spaced apart from each other, extend outside the Y-shaped support block. A conical block is slidably connected to the bottom inner wall of the installation groove, with the bottom of the conical block extending outside the Y-shaped support block. This utility model, by incorporating the extension mechanism, solves the problem that existing steel drum shaping devices, when encountering situations such as inwardly concave drum walls or bulging bottoms, are inconvenient to fully extend into the steel drum, making it difficult to directly apply force to these deformed parts and restore the drum to its original shape. This results in the internal structure of the steel drum not being effectively repaired, affecting the overall strength and stability of the steel drum.