Supported ionic liquid is a new kind of solid materials prepared by loading ionic liquids onto different carriers through physical adsorption or chemical bonding, which has the characteristics of both ionic liquids and carriers. This process can significantly improve the utilization of ionic liquids, solve the problems of high viscosity, mass transfer and separation of ionic liquids, and expand the application field of ionic liquids. This paper reviews the research progress and application of supported ionic liquids in recent years, summarizes the advantages and disadvantages of different carriers and some problems existing in the current application. Furthermore, the prospect to the development and application of supported ionic liquids is also discussed.