Welding operation platform for large pressure vessel

The utility model relates to a welding operation platform for a large pressure vessel. A supporting steel base is arranged in the position corresponding an interval base and at the bottom of an inner cavity of a pressure tank, an electromagnet attraction device is arranged below the interval base, a vertical guide column is arranged on the supporting steel base, a rigid connecting sleeve is clamped to the top end of a sliding sleeve body, the side wall of a cylinder barrel of an electric hydraulic cylinder is fixedly welded to the inner wall of the top end of the rigid connecting sleeve, and the stretch-out end of the electric hydraulic cylinder is embedded in the top end face of the vertical guide column. The overall structure of the welding operation platform is fast and efficient to construct, and the overall structure can be stable through magnetic force connection between the supporting steel base and the electromagnet attraction device; meanwhile, the position adjustment of the sliding sleeve body in the vertical direction is driven through the electric hydraulic cylinder, and therefore the height change of the welding operation platform in a pressure tank body can be indirectly adjusted, implementation of the welding process is facilitated, high practical value is achieved, and the welding operation platform is particularly suitable for welding large pressure vessel tank bodies.