Swing stopping device for underwater device

The utility model relates to the technical field of ships, in particular to a swing stopping device for an underwater device, which comprises an A-type portal frame, a first support and a clamping mechanism, the first support is suspended on the A-type portal frame, a first guide wheel is arranged on an upper cross beam on one side of the first support close to the A-type portal frame, and a rope falling prevention device is arranged in the middle of the first support. The clamping mechanism is arranged on the other side of the first support, a flange support is arranged on the inner side of the lower end of the first support, an underwater device limiting seat is arranged below the flange support, a mooring rope is wound between the first guide wheel and the rope falling prevention device in sequence, and one end of the mooring rope is connected with the underwater device. According to the anti-oscillation device disclosed by the utility model, the large-amplitude oscillation of the underwater device in the