Abstract: Dynamic submarine cable is an important equipment in the development of floating wind power, which undertakes the task of transmitting power and signal. The operating environment of dynamic submarine cable and static submarine cable is very different, and its structural form is obviously different. According to the requirements of the ability of dynamic submarine cable to resist environmental load and the need to ensure the safe transmission of cable, based on the existing static submarine cable structure, the functional analysis and structural design of the conductor, insulation, sheath and armor of dynamic submarine cable were carried out. In order to deal with the tensile bending and torsional load of dynamic submarine cable, the design of wet insulation structure and even layer armor are proposed. Different from the inner and outer liner composed of PP rope of static submarine cable,dynamic submarine cable adopts the structure of inner and outer sheath. The structural design method provides a certain reference for the design of dynamic submarine cable for floating wind power.