Novel rotary mechanism of tower crane

The utility model provides a novel rotary mechanism of a tower crane. The novel rotary mechanism comprises a wound-type motor, a hydraulic coupler, a speed reducer and a pinion, wherein the wound-type motor outputs a torque, and drives a pump wheel in the hydraulic coupler to rotate, energy is obtained from liquid of the flow of the pump wheel to flow in a worm, the torque output by the worm is transmitted to the speed reducer, the speed reducer realize speed reduction by a one-stage fixed-axle gear and a two-stage star gear, and the pinion passing through an output shaft is meshed to a rotary support to generate a rotary power. The novel rotary mechanism of the tower crane, provided by the utility model, solves the problems of complicated structure, high production cost and low work efficiency of the rotary mechanism of the tower crane in the prior art.