The invention discloses a user data anonymous sharing method based on league chain encryption. The method comprises the steps as follows: each founding member mechanism builds a respectively corresponding network data collection node and accesses a league chain network, to form an initial chain; a common member mechanism builds the network data collection node after passing through verification, and sequentially accesses the initial chain to build a league chain; the network data collection node acquires a pseudonym identity and symmetric keys corresponding to the pseudonym identity; after acquiring data, the network data collection node sends an uploading request to a network data storage node; the final encrypted data is decrypted via the private key pair of the network data storage nodeto acquire pseudonym encryption data; the network data storage node stores a corresponding relationship between the pseudonym encryption data and the pseudonym identity into a local database; and thenetwork data storage node compresses the data stored within set time into a block, and adds the block into the league chain. Through building the league chain, the permissions of the common member mechanisms are effectively controlled, and the privacy of each member mechanism is ensured.