Steel hanging box bottom plate plugging device for underwater concrete bottom sealing

The utility model discloses a steel hanging box bottom plate plugging device for underwater concrete bottom sealing, which comprises a plurality of long arc-shaped steel plates, a plurality of long arc-shaped steel plates, a plurality of long arc-shaped steel plates, a plurality of long arc-shaped steel plates and a plurality of long arc-shaped steel plates, wherein the inner sides of the long arc-shaped steel plates cling to the outer circumference of a steel casing; the number of the short arc-shaped steel plates is multiple, one short arc-shaped steel plate is arranged above the splicing seam of every two adjacent long arc-shaped steel plates, the inner sides of the short arc-shaped steel plates are also tightly attached to the outer circumference of the steel casing, and the gap between each short arc-shaped steel plate and the bottom plate of the steel hanging box is filled with non-water-soluble filler; the number of the pressing rods is the same as that of the long arc-shaped steel plates, one end of e