Private data access control method and device based on alliance chain and terminal equipment

The invention provides a privacy data access control method and device based on an alliance chain and terminal equipment. The alliance chain comprises consensus nodes and data nodes; the consensus node is used for storing summary information of private data, the data node is used for storing the private data, and the method comprises the steps that access information of a user is acquired, and the access information comprises a user attribute, a user identifier, a user public key and a data identifier of to-be-accessed data; based on the user identifier, the user attribute and the user public key, performing communication interaction with each consensus node, and determining whether the user is a legal user; if yes, determining a data node for storing the to-be-accessed data based on a data identifier of the to-be-accessed data; and obtaining the to-be-accessed data from the data node, and sending the to-be-accessed data to the user, thereby realizing access control of the private data. According to the inven