Perovskite nanocrystals open up bright future for nanolasers, for their various instinct advantages (such as large absorption cross section and optical gain, high fluorescence quantum yields, etc.) can greatly benefit the design and fabrication of nanolasers with low threshold, high emission efficiency and well integration. Although numerous investigation efforts have been devoted into exploring the perovskite nanolaser of single-photon-pumped type, the study of up-conversion lasing excited by two-photon-pumping is still established on the structures of micrometer scale with multiple mode, which is not in favor of improving the working stability and scale miniaturization of future nanolasers. In order to expand the application of perovskite nanocrystal in nanolasers, we studied the perovskite (CsPbX 3 , X = Cl, Br) nanoplates fabricated by supersaturated recrystallization approach, and observed single mode up-conversion lasing from single nanoplate with low threshold of 4.84 µJ/cm 2 . In addition,