Abstract:All-inorganic perovskite quantum dots (IPQDs) are identified as photoluminescence and light-emitting material with great potential. CsPbX3(X=Cl, Br, I) was considered to be the most attractive one with such characteristics as narrow full width at half maximum, high stability, and low-cost solution fabrication process. In this paper, the synthesis of inorganic perovskite quantum dots was designed according to supersaturated recrystallization technique, which is operated at room temperature. This process can be finished within a few seconds and no longer needs inert gas and thermal injection. CsPbX3 was fabricated based on different halide ratio. CsPbX3 QDs were measured and analyzed by photoluminescence, absorption and X-ray diffraction in order to study the luminescence mechanism of different CsPbX3. The device with white light emission was realized by using blue light-emitting diode chip to inspire thin film of CsPbX3 quantum dots. The light spectrum and white light emission properties were analyzed.