Abstract: The combination of hydrogen energy and renewable energy generation is one of the important ways to achieve the goals of carbon neutrality and the peak of carbon dioxide emissions, where power electronic converters are widely used. In order to realize the efficient operation of the electrolysis hydrogen production system, the power electronic converter is required to have the characteristics of low voltage and high current capability, low output current ripple, high step-down ratio, and high reliability.Firstly, this paper analyzes the electrolyzer model, and studies the characteristics and technical indicators of the existing commercial electrolyzer. Secondly, this paper sorts and classifies the power electronic converters applied in various electrolysis hydrogen production systems including the alkaline electrolyzer, the polymer exchange membrane electrolyzer and the solid oxide electrolyzer, and various topologies are analyzed and compared. Meanwhile, the potential applications, existing problems and development trends of power electronic converters for producing hydrogen from renewable energy sources are discussed and summarized.