Ionic liquids are widely used in the field of CO2 absorption and catalytic CO2 conversion due to their unique prop-erties of adjustable structure,as well as low volatility,good thermal stability and chemical stability.This paper mainly re-views the interaction between ionic liquids and the research progress of ionic liquids in photocatalytic conversion,electro-catalytic,photoelectrocatalytic and photothermalcatalytic conversion of CO2,and finally provides an outlook on the future development of ionic liquids.