The invention discloses an intelligent preprocessing tool and method applied to mass P2P network loan financial data. According to the invention, accurate and efficient preprocessing can be performed on mass P2P network loan financial data before being stored into a standard financial service database, and the accuracy and validity of the data are ensured, so that an effective monitoring mechanism for a P2P network loan platform is built, and supervision for the P2P network loan platform is effectively enhanced. Preprocessing comprises that validity and integrity checking rules are established so as to realize checking for the data before getting into the database; data classification, data deduplication, data correction, data conversion and state calculation are performed so as to realize processing for the data before getting into the database; and finally, the data is loaded into the standard financial service database.