In order to solve the problem that the traditional linear cable is not conducive to the operation and maintenance of floating wind farm cables, the concept of dynamic cable is proposed, and the influence of different structural forms on the cable is analyzed. The fully coupled time-domain simulation of the semi-submersible floating foundation under the combined action of wind, wave and current loads is carried out. The influence of traditional catenary and slow waveform dynamic cables on the hydrodynamic performance of the floating wind turbine is analyzed. It is found that the influence of the slow waveform cable on the hydrodynamic performance is small, which is beneficial to the power generation of floating wind turbine. The power generation efficiencies of the floating wind turbines using different cables are compared, and the results show that the reduction of the power generation efficiency of the wind turbine using both cables decreases with the increase of the angle between the wind and waves and the reduction of the power generation efficiency using the slow waveform cable is smaller than that using catenary cable.