Fuente: Wipo "BigData" The invention relates to the field of information security, and relates to a security big data privacy protection sharing method based on a block chain. A plurality of data storage parties and a plurality of data sharing parties are set, each data storage party is remotely connected with a storage cloud platform, and each data sharing party is remotely connected with the storage cloud platform; ablock chain network is set, wherein all the data storage parties and all the data sharing parties are used as connection nodes in the block chain network; the data protection sharing method comprisesa process of carrying out encryption protection on data, and further comprises a process of sharing the data. The technical scheme has the beneficial effects that a blockchain technology is used for providing data integrity verification and key management, and the problem that a semi-trusted cloud platform tampers security data and the problem of single-point failure of attribute authority are solved respectively.