Compared with traditional semiconductor quantum dots, all-inorganic perovskite quantum dots have the advantages of excellent luminous performance, adjustable emission wavelength, and high photoluminescence quantum yield. They are ideal materials in the field of optoelectronics and have been widely used in light-emitting diodes, solar cells and other optoelectronic devices. The research progress of all-inorganic perovskite quantum dots in recent years was reviewed. Firstly, the synthetic methods of all-inorganic perovskite quantum dots were introduced. Then the effects of ion doping and ligand modification on all-inorganic perovskite quantum dots were analyzed. Additionally, the application of all-inorganic perovskite quantum dots in light-emitting diodes was described. Finally, the future development trend of all-inorganic perovskite quantum dots was prospected to provide further reference and in light-emitting diodes.