The invention discloses an inorganic 
perovskite material, a preparation method thereof and an LED device. The preparation method comprises the following steps that: S1, a 
tin source and a 
bismuth source are dissolved in a first 
solvent to obtain a first solution, and a cesium source is dissolved in a second 
solvent to obtain a second solution, wherein the 
tin source is a stannous compound, the cesium source, the 
tin source and the 
bismuth source are 
chlorine sources, and / or the first 
solvent and the second solvent are 
chlorine sources; and S2, the first solution and the second solution are mixed, stirring and heating reaction is performed, and then 
solid-liquid separation, washing and 
drying are performed. The preparation raw materials are low in cost, safe and non-toxic, the synthesis operation is simple, crystals can be obtained through a heating reaction, the 
equipment requirement is low, the reaction condition requirement is loose, the product 
crystallinity is good, particles are uniform, the 
fluorescence yield is high, and the obtained product inorganic 
perovskite material does not contain organic groups, is high in light stability and 
heat stability, has potential application value in preparation of high-
fluorescence-yield 
blue light fluorescent 
powder, and can be further applied to preparation of LED devices.