The invention relates to an incremental change data analyzing and downloading method and system based on SVN. The method includes the steps that a man-machine interaction interface is built, and an operator has access to an SVN server through the man-machine interaction interface and sends an operation request to the SVN server; whether a user has access to the SVN server for the first time is judged, if the answer is positive, detection is carried out on a file in the SVN server for the first time, and a local SVN replication is generated, and otherwise, SVN updating is carried out on a local work replication, and information of files changing during the time from updating last time to updating this time is extracted; the changed files are copied and transferred to a temporary folder in a unified mode and are compressed and stored; the compressed files in the temporary folder are output through a network interface, and file downloading is achieved. According to the method, codes are managed through SVN, changed data are automatically extracted, efficiency is improved, complicated work for counting online codes of workers is reduced, labor is saved, and cost is lowered.