Abstract: With the rapid development of blockchain technology and audit information technology, the integration of the concepts of blockchain and big data audit will greatly enhance the data function and information economic function of audit. Through the exploration of the application of blockchain technology in big data auditing, and aiming at the shortcomings of audit information construction at home and abroad, based on the existing data centers built in our province, the author puts forward the audit data based on unchained audit data and blockchain audit data. The design concept of the integration of different data processing procedures. Based on the SWOT analysis of the application direction of the blockchain, it proposes the way to form the alliance chain through the consensus mechanism and the agreed rules of the smart contract, and designs the application model for comparison and selection, and proposes countermeasures and paths for practice, technology integration, and talent training. Innovative ideas and research results provide cutting-edge exploration and new thinking for the development of a unified audit information platform, data sharing mechanism and big data application in the future.