The invention discloses a digital asset classification management method based on a block chain. The method comprises the steps: determining the digital asset information according to the actual conditions of all digital assets in the block chain, grouping the digital assets in the block chain according to the actual application scene of the block chain, and determining the type of each group of digital assets according to the interchangeability of the digital assets, wherein the type includes interchangeable digital assets, non-interchangeable digital assets and partially interchangeable digital assets, then creating digital asset contracts for all the digital assets in the block chain, and performing management. The digital asset management comprises eight functions of creation, issuing,query, additional issuing, destruction, transfer, freezing and authorization, different query modes are adopted for different types during digital asset query, so that accurate query is realized. According to the invention, a general digital asset expression form is designed, and the classification management of the digital assets is realized based on the general digital asset expression form, sothat the universality of the digital assets is improved.