The focus on clean energy drives the spotlight towards hydrogen fuel cell technology, particularly in the NEV sector. The article details the 400KW hydrogen fuel cell stack, describing its structure, components, and functionalities. It explores the roles of key components such as bipolar plates, membrane electrode assemblies, proton exchange membranes, and sealing components in ensuring efficient energy conversion. The working principles of the stack, involving hydrogen and oxygen reactions facilitated by catalysts and proton exchange membranes, are explained. Emphasizing the significance of the proton exchange membrane in controlling the flow of protons and electrons, the article delves into the generation and output of current in the stack. The performance advantages of the 400KW hydrogen fuel cell stack, including stable current and voltage output, are highlighted. Overall, the article portrays a positive sentiment towards hydrogen fuel cell technology as a clean and efficient energy solution for sustainable development.