With the growing global demand for clean energy, hydrogen energy, as an important renewable energy reserve, has garnered widespread attention for its storage technology. Onshore hydrogen storage systems pose risks such as hydrogen leakage, drinking water contamination, and catastrophic injuries. In contrast, offshore geological environments are relatively stable and well-sealed. Thus, offshore salt cavern hydrogen storage technology has received widespread attention and rapid development. The stable operation of onshore salt cavern projects, like the Jintan Gas Storage, has provided valuable experience for constructing offshore salt cavern hydrogen storages. It is necessary to closely integrate the underwater special geological conditions and the specific physical and chemical properties of hydrogen, while also considering factors such as geology, hydrology, biochemistry, and mineralogy, to ensure a rational planning and safe operation of offshore salt caverns. The rapid development of offshore salt cavern hydrogen storage technology presents both opportunities and challenges: (1) It is crucial to promptly conduct such research to further advance the development and application of related technologies in various maritime regions; (2) We must promote a comprehensive development of the hydrogen energy industry, systematically improving the efficiency of hydrogen storage and transportation, establishing a secure industrial chain, and securing a favorable leading position in the global clean energy competition. Looking ahead, offshore salt cavern hydrogen storage technology will not only provide theoretical support for the development of renewable energy technologies in China but also play a significant role in promoting the low-carbon sustainable development.