The invention provides a resource management method and system based on metadata self-definition extension. The concrete implementation steps of the method of the invention include: S1, constructing metadata or metadata set; 2, matching that metadata or the metadata set into the designated directory; S3, bringing back the information resources to be uploaded through the external program access interface; 4, importing or adding information resource; S5, performing user-defined extensionon the metadata. The technical proposal of the invention solves the problem of low accuracy and incompletenessin the process of extracting metadata only relying on manual mode in the resource management, The manual matching + automatic matching algorithm greatly improves the work efficiency of metadata extraction, has a higher accuracy, and greatly enriches the index library, and brings a better user experience for advanced search.