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Under the background of the rapid accumulation of marine data volume and the rapid development of data technology, the efficient management and value mining of marine data has become one of the key topics. This paper has constructed a regional marine data sharing system, which combined asymmetric encryption technology and smart contract technology in blockchain. In this double-chain system, the marine-data-supply-chain includes the sharing nodes, and the marine-data-demand-chain includes the nodes to be matched. The system achieves decentralization, safe and efficient sharing, voluntary circulation of value, effective growth of marine data resources by smart contracts in blockchain, which not only promotes the sharing and circulation of marine data between different regions, but also protects the legal control rights of resource suppliers. This system is a combination between blockchain technology and traditional marine resources survey database and, will manage to solve the problem of data sharing in the development of marine economy in different regions theoretically.