A metadata storage method, device, and a server are disclosed. The method includes: obtaining a metadata to be processed from the preset metadata storage system or from external of the preset metadata storage system; determining a type of metadata to be processed; processing the metadata to be processed to obtain a new metadata in a storage format corresponding to the type of metadata to be processed, wherein the storage formats correspond to different types of metadata to be processed and comprise at least one identical information kind for different types of metadata; and storing the new metadata in the preset metadata storage system. Thus a search for a metadata can be performed through a unified interface in a search engine, which is convenient to use.