Rotary lifting appliance capable of operating underwater

The utility model discloses a rotary lifting appliance capable of operating underwater. A pulley block, a planetary reducer and a rotating mechanism are arranged on a rack; a hydraulic motor is mounted on the planetary reducer, and the planetary reducer is connected with the rotating mechanism through a chain wheel and chain mechanism; the rotating mechanism comprises a thrust bearing and a lifting hook handle assembled in the thrust bearing, and a lifting hook nut used for being connected with a lifting appliance is further arranged in the rotating mechanism; an upper sealing element is arranged on the outer side of the thrust bearing, and a lower sealing element is sleeved on the lower part of the lifting hook handle; a small chain wheel in the chain wheel and chain mechanism is connected with an output shaft of the planetary reducer through a flat key, a large chain wheel is connected with a lifting hook handle of the rotating mechanism through a flat key, and a roller chain is installed on the large chain