Data privacy calculation method and system based on block chain

The embodiment of the invention provides a data privacy calculation method and system based on a block chain, and the method comprises the steps: obtaining a corresponding business type identifier in a business request instruction, determining a corresponding variable calculation formula, and transmitting the variable calculation formula and a private key to a business node; the service node determines a requester calculation amount based on the service attribute information and a variable calculation formula, and correspondingly sends the requester calculation amount and the encrypted service information to a consensus node; and the consensus node summarizes the business information of the same business type identifier, pre-matches the business information with a pre-stored processing qualification range corresponding to all the service nodes, and sends the business information and the public key to the service nodes based on a pre-matching result. By adopting the method, the identity data of the user and th