Block chain-based due diligence investigation file management system and method

The invention relates to a block chain-based due diligence investigation file management system and method. The due diligence investigation file management system comprises a block chain system architecture, a user system, an authentication system and a file system. The block chain system architecture is used for building a file management network architecture based on a block chain, the user system is used for identity registration, protocol making and user sending protocol application for accessing a file, and the authentication system is used for authenticating the user and authorizing the operation authority of the user in the file system; and the file system is used for checking and auditing the investigation file of the target company and the investigation file of the third party in the aspects of law, finance, business, human resources and the like. According to the due diligence investigation file management method, file management is carried out by formulating the contract protocol, and based on mult