ABSTRACT
Flavonoids have many physiological and pharmacological activities. Ionic liquids are increasingly used in the extraction of flavonoids from natural products due to their unique properties. In this paper, various extraction methods of natural flavonoids were reviewed and summarized. The effects of anion and cation type, length of carbon chain, and bond cooperation on the extraction of natural flavonoids in ionic liquids, especially imidazole type ionic liquids, were also reviewed. Suggestions on selection of extractant for ionic liquid extraction of flavonoids were given. The advice of the green recovery of ionic liquids and the development of edible ionic liquids for the future direction of development were suggested. This study will lay the foundation for the basic research and industrial application of ionic liquids in the extraction of natural flavonoids.