Underwater swing stopping device for hanging box cofferdam

The utility model relates to the field of cofferdam construction, in particular to an underwater anti-swing device for a hanging box cofferdam, which comprises a plurality of groups of fixing blocks fixedly arranged on keels at the peripheral edge of a pile casing opening at intervals; the steel casing abutting blocks are movably arranged at the ends, away from the peripheral edge of the casing opening, of the fixing blocks and used for abutting against the steel casing. And the abutting structures are arranged in the fixing blocks and used for driving the steel casing abutting blocks to abut against the steel casing. After the steel casing penetrates through a casing opening of a cofferdam keel, the multiple sets of steel casing abutting blocks on the peripheral edge of the casing opening abut against the steel casing under the action of the abutting structure, the multiple sets of fixing blocks and the steel casing abutting blocks are arranged on the peripheral edge of the casing opening at equal angles, an