The invention provides a digital archive system based on a blockchain. The digital archive system includes an archive management system and a digital archive blockchain. The archive management systemincludes modules of archive piece forming, archive volume forming, archive viewing, archive handover, archive identification, archive destruction and archive counting. The digital archive blockchain includes an archive transaction account book and an archive cabinet. According to the digital archive system, authorization passwords are set, blockchain encryption technology is utilized, entire-network maintenance is carried out, thus tampering cannot occur, security, authenticity and credibility of digital archives are guaranteed, phenomena of usurping, illegal accessing and the like of the archives are eliminated, a traditional archive verification process is simplified, auditing costs are reduced, low-cost use of the archives is realized, and at the same time, losses caused by archive tampering and forging on units are also avoided. Archive management service behaviors at any time can be queried, and viewing and handover records cannot be tampered with, and can be traced. Identity confirmation and qualification authentication are realized, digital economy development and new-old kinetic energy conversion are facilitated, trust costs are reduced, and social system running efficiencyis improved.