The invention discloses a method for quantitatively analyzing zeolite imidazate framework (ZIFs) material Lewis acidity. The method is based on the quantum chemistry density functional theory to represent and measure the Lewis acidity of a ZIFs material, adsorption of probe molecules to the ZIFs material is studied, the characteristic frequency or displacement of the probe molecules is determined, electron transfer of Lewis acid sites is quantitatively analyzed according to electric charge calculation of the natural bond orbital (NBO) theory, and finally the Lewis acid sites and the intensity of the ZIFs material are determined. The method includes cluster model establishment, structure optimization and vibration frequency calculation of stable configuration, NBO electric charge analysis, electron transfer calculation, and Lewis acidity analysis and representation. According to the method, the Lewis acid sites can be identified and the intensity and the density of the Lewis acid sites of the ZIFs material can be quantitatively represented without any experiment. The method can also be expanded to measurement and representation of Lewis acidity of other known materials of crystal structures.