All-inorganic perovskite quantum dots CsPbI₃ have excellent optical properties and are suitable for red light emitting diodes and solar cells. However, the large difference of their atomic radius, as well as the migration of halogen ion caused by the intrinsic soft-lattice nature, would lead to the phase transition and degradation of CsPbI₃ quantum dots. In this paper, CsPbI₃ quantum dots (CsPbI₃@Pb-MOF-OLAMI) were synthesized using Pb metal organic framework (Pb-MOF) as lead sources in perovskite. The results showed that the thermal stability improves by 40%, and the light stability improves by 15 times after adding the lead iodide (PbI₂) solution. This stability improvement is mainly due to the void-confinement effect. The porous structure of Pb-MOF hinders the migration of halogen ions, which avoids or reduces the formation of defects, and thus alleviates the degeneration of perovskite. This study provides a new strategy for improving the stability of CsPbI₃ perovskite quantum dots.