The present application discloses a method and device for generating an image file. A specific implementation mode of the method comprises: acquiring demand information for generating an image file, wherein the demand information comprises identification information of a to-be-imaged file and configuration information corresponding to the to-be-imaged file; acquiring an installation file of the to-be-imaged file according to the identification information; installing the installation file on a pre-created virtual host to generate the to-be-imaged file; selecting a custom file matching the configuration information from a pre-stored custom file set; and updating the to-be-imaged file based on the custom file matching the configuration information to generate the image file. The implementation mode realizes batch production of the image file.