Abstract: The fixed magnetic field of a ship is mainly degaussed by the pulse current output from the degaussing main power supply, and its degaussing effect will directly affect the magnetic stealth level of the ship. By sorting out the composition and structure of different types of energy storage degaussing main power supply systems, their working principles, advantages and disadvantages were reviewed, and the technical development trend of large ship energy storage degaussing main power supply systems was prospected. Topology structures for lithium battery energy storage degaussing main power supply system and high-speed motor energy storage degaussing main power supply system were proposed, and key technical issues were summarized such as the decoupling compensation and degaussing current synchronization control technology of multiple degaussing main power supplies. The research results can provide reference for the design of energy storage degaussing main power supply systems for large ships.