Storage method based on block chain

The invention relates to the technical field of cloud computing, in particular to a block chain-based storage method, which comprises the following steps of: Y1, performing graph conversion on block chain data to obtain a complete graph, and performing comprehensive analysis according to the number of active nodes and the data volume of the block chain to obtain a fragment quantity; y2, selecting active nodes consistent with the fragment quantity in quantity, cutting the block chain data and the complete graph according to the storage state of the selected active nodes to obtain a plurality of data fragments and partial graphs corresponding to the data fragments, and sending the data fragments and the partial graphs to the corresponding active nodes for storage; y3, node storage spaces are cleaned, the number of the nodes is updated, and the updated active nodes are sent to the Y1 and the Y2; through the modes of reasonably selecting the storage nodes, cutting the data, optimizing the storage, performing comm