The invention relates to a document entering and comparing method comprising the steps of firstly judging whether a document to be entered is a paper document, if yes, automatically scanning the paperdocument via front-end equipment and entering the same into an original format document library, and if the document to be entered is an electronic document, directly entering the document into the original format document library, converting all documents in the original format document library into the documents with the unified format; then performing key attribute marking and basic managementon the documents; and at last comparing the document based on content via a Nakastu algorithm and a word segmentation system, and associating the documents according to comparison similarity degreesand entering the same into a database. According to the method provided by the invention, the various kinds and formats of documents can be automatically entered, classified in a unified manner, intelligently managed and compared with the existing documents; and the method is improved in document utilization efficiency, and saved in document comparison time, and enhanced in document management efficiency.