The invention provides a design method and device of an audit block chain in an energy network. The method comprises the steps of firstly defining the access policy according to the physical network of the pre-constructed audit block chain in the energy Internet; then using the access policy and the pre-designed smart contract to access the audit block chain, and pre-designing the smart contract based on the transaction business process of the energy Internet. The invention ensures the stable operation of the audit network, prevents the transaction data from being tampered with, and can realize the cross service across industries and regions. The technical proposal provided by the invention can ensure that the private secret data and the trade secret data cannot be tampered with, the transaction process can be traced, the audit service with public credibility is provided to the transaction organization and the supervision organization, and the safety of the energy internet transactionis ensured. The method provides the two-way accounting books, traces the flow of energy and financial assets, monitors illegal transactions in energy and financial assets, provides data validation services, confirms the integrity and validity of data, and provides data screening services to ensure the truthfulness and reliability of transaction reporting, clearing and settlement of confidential data.