The platform multi-energy DC micro-grid system has a small capacity, and the wind power generation unit is affected by wind speed changes, resulting in the DC bus voltage stability problem being particularly prominent. In view of the structural characteristics of the small wind turbine on the platform, the mechanical response characteristics of the motor and the control structure of the interface converter of the wind power unit are analyzed, and a virtual inertia control method is proposed for the small wind power unit of the mobile offshore platform. By establishing the interface converter control small signal model, the experimental results show that the proposed control method effectively enhances the inertial response of small wind turbines on offshore platforms and significantly improves the stability of the DC microgrid system.