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[Introduction] Aiming at the characteristics of offshore converter station, this paper proposes the design scheme for auxiliary power system of offshore converter station. [Method] By analyzing the requirements for auxiliary power system at offshore converter station both at home and abroad, in combination with the construction situation and actual needs of offshore wind farms, a design scheme for the auxiliary power system at offshore converter station was proposed. [Result] The scheme of setting up off-site power supply for offshore converter station is proposed for the first time. A simplified wiring scheme can improve equipment utilization and conversion efficiency of auxiliary power system, and its control protection is analyzed to verify the practicality and reliability of the wiring scheme. Comparing with the scheme of low-voltage distribution system of offshore booster station, the optimization scheme of not setting emergency section bus and connecting diesel generator in parallel is proposed. Through analyzing the load characteristics of offshore converter station, the method of selecting the capacity of diesel generator, the capacity of fuel tank and the diesel generator incoming circuit breakers is proposed. [Conclusion] Therefore, it has been optimized while ensuring the reliability of auxiliary power system, which has strong practicality and applicability, and provides guidance for the design of auxiliary power system for offshore converter station.