The invention discloses high-refractive-index modified
silane. A preparation method of the high-refractive-index modified
silane comprises the following steps: mixing a
sulfur-containing heterocyclicmonomer, a
silane monomer and an
organic solvent, adding an acidic stabilizer and a catalyst, adding water dropwise under stirring, performing heating, performing a reaction, performing cooling, performing a
neutralization reaction, performing washing by using water, and performing separation to obtain the high-refractive-index modified silane, wherein the acidic stabilizer is an
organic acid withPKa satisfying a relationship of 0<=PKa<=3.0. According to the method provided by the invention, the
sulfur-containing heterocyclic modified silane
monomer is prepared by an improved process, the
sulfur-containing heterocyclic modified silane
monomer can be used as an additive or a synthetic
raw material of an organic
silicone material and as a component of a packaging material, and improves light
transmittance of a product; and the product has a high yield and little smell and is beneficial to application.