Abstract: In recent years, with the growing global attention to low-carbon economies and energy transitions, hydrogen energy has become a key component of national energy strategies due to its high energy density and zero-emission characteristics. Compared with physical hydrogen storage technologies, chemical hydrogen storage has become a major focus of hydrogen energy research because it can provide higher hydrogen density and more stable storage processes at ambient temperature and pressure. This paper reviews the research progress of chemical hydrogen storage materials, focusing on two main technologies: metal hydride hydrogen storage and organic liquid hydrogen storage. It explores their hydrogen storage mechanisms, performance optimization, and sustainable development pathways. The paper is divided into the following sections: Progress in metal hydride hydrogen storage technology, which includes the performance optimization of different metal hydride storage materials, reactor optimization design, and their economic and environmental impact assessments; The current status of organic liquid hydrogen storage technology, which discusses the selection of organic liquid hydrogen storage materials, catalyst optimization, and their economic and environmental impacts; Other chemical hydrogen storage technologies and methods, including modified carbon materials for chemical adsorption hydrogen storage, the integration of chemical hydrogen storage with solid oxide fuel cells, and the combination of chemical hydrogen storage with green hydrogen production technologies. Through an in-depth comparison and analysis of these technologies, this paper aims to provide theoretical support for the optimization and application of chemical hydrogen storage technologies in the future, and offer references for the sustainable development of hydrogen energy.