Confidential file management method, platform system and confidential file management terminal

The invention discloses a confidential file management method, a confidential file management platform system and a confidential file management terminal. The confidential file management method comprises the following steps: completing networking and access with a confidential box and a confidential cabinet; encoding the current confidential file, establishing a record log, and determining a file reading type; when the confidential file belongs to the internal reading file, the code is associated with the confidential box, an internal reading object of the confidential file is determined, corresponding identity verification information is sent to the confidential box tracked by the electronic fence, and the confidential box completes circulation of the internal reading file through the confidential cabinet; and when the confidential file belongs to the external reading and handling file, determining an external reading and handling object of the current confidential file, sending delivery box request informa