The invention relates to a method for automatically intertransmitting data between an FTP (File Transfer Protocol) database and an HDFS (Hadoop Distributed File System) database. The method comprisesthe following steps: data extraction, wherein a GetFTP processor queries and extracts FTP data in the FTP database, and a GetHDFS processor queries and extracts HDFS data in the HDFS database; data conversion, namely performing attribute configuration on an Update Attribute processor, converting the extracted FTP data into HDFS (Hadoop Distributed File System) data by the Update Attribute processor, and converting the extracted HDFS data into the FTP data; data loading, respectively carrying out attribute configuration on the PutHDFS processor and the PutFTP processor; the PutHDFS processor loads the HDFS data obtained through conversion into a target folder of the HDFS database, and the PutFTP processor loads the FTP data obtained through conversion into the target folder of the FTP database. According to the invention, the error rate of data conversion is reduced, and efficient extraction and mutual transmission of data are realized.