The invention provides a file version management method and system. The method includes the steps of setting a COM (component object module) component on a client; creating a file object, uploading a physical file, corresponding to the file object, to a server through the COM component, recording version information of the file object in a version information table, and recording storage information of the physical file in a file address information table; updating the file object by a WebService method, uploading the physical file, corresponding to the uploaded file, to the server through the COM component, and recording new version formation of the file object in the version information table; downloading the file object by the WebService method. The file version management method and system have the advantages that inter-platform access barrier is overcome and cross-platform operation is achieved.