Underwater auxiliary alignment assembly and ultra-large jacket

The utility model relates to the technical field of jacket installation, in particular to an underwater auxiliary alignment assembly and an ultra-large jacket, which comprises a stand column, a plurality of fixed sleeve plates distributed in an annular array are fixedly connected to the outer sides of the upper end and the lower end of the stand column, and a sliding plate is movably inserted into one end of each fixed sleeve plate; the clamping frame is in a U shape, the opening end of the clamping frame is opened outwards, a vertical plate is fixedly connected to the middle of the clamping frame, and a magnet piece is fixedly embedded in the surface of the vertical plate; the device has the beneficial effects that the upper end and the lower end of the outer side of the stand column are fixedly connected with a plurality of fixing sleeve plates distributed in an annular array mode respectively, one end of a sliding plate is fixedly connected with a U-shaped clamping frame, the middle of the clamping frame i