Abstract: This paper designs a dedicated storage tank for products with special requirements on storage environment. Firstly, the advantages and disadvantages of existing technologies and various structural schemes are analyzed and compared to determine the optimal structure of the storage tank and complete the overall scheme design. According to the design process, the sealing performance, structural strength and monitoring device of the storage tank are designed. Subsequently, experimental verification is carried out and the test data are analyzed and summarized. The research results can provide engineering application references for the long-term storage of large underwater products.