Supercritical carbon dioxide microemulsion technology on the basis of the supercritical fluid technology and microemulsion technology,which combines supercritical carbon dioxide with the microemulsion technology,has expanded the application fields of supercritical fluid. In this paper,the structural characterization methods of the supercritical carbon dioxide microemulsion and the progress of the molecular dynamics simulation were summarized,the extraction separation of the ferment liquor in supercritical carbon dioxide microemulsion was introduced,and the types of the novel microemulsion containing ionic liquids and the application of nanomaterials were discussed. As a typical green solvent and a hot topic,the ionic liquids used in the microemulsion can not only benefit the environment,but also enlarge the range of applications.