The structure of organic⁃inorganic hybrid perovskites and their corresponding solar cells were overviewed. The characteristics of ionic liquids and applications of ionic liquids in three-dimensional hybrid perovskite solar cells were summarized.And then the effects of different ionic liquids on the properties of low-dimensional layered perovskite films and devices were introduced，the applications of ionic liquids as organic spacer in low-dimensional layered hybrid perovskite solar cells were emphasized. Finally， the problems existing in the applications of ionic liquids were discussed， as well as the future research directions in this field.