Block chain-based data security sharing method

The invention discloses a block chain-based data security sharing method, which comprises the following steps of: presetting a modeling data management and control agent in all mechanisms needing joint modeling for data security sharing among the mechanisms; constructing a block chain alliance chain network in a current joint modeling range among modeling data management and control agents, adding all mechanisms into the block chain alliance chain network, and generating an org node of each mechanism; enabling the modeling data management and control agent to construct a privacy set in an alliance chain of a mechanism where the modeling data management and control agent is located, wherein data is not shared to a whole alliance chain account book, and a sharing range of the privacy set is set; and enabling the modeling data management and control agent to upload the data in the institution to the block chain through the smart contract, and decide a data sharing range. The financial alliance chain of the smart