Glass sheet with gradient refractive indexes and preparation method of sheet

The invention discloses a glass sheet with gradient refractive indexes and a preparation method of the sheet. The glass sheet consists of a glass substrate and multiple layers of glass membranes on the surface of the glass substrate, wherein the refractive index of a material of the glass membrane at the innermost layer is equal to or greater than that of a material of the glass substrate, and the refractive indexes of materials of the glass membrane layers are increased layer by layer from inside to outside. The preparation method adopts a screen printing process, multiple glass slurry layers containing nanoparticles with high refractive indexes are coated on the surface of the glass substrate (the mixing amount of the nanoparticles is changed layer by layer), main ingredients of slurry include low-temperature glass powder, the nanoparticles with high refractive indexes, an adhesive, a dispersant and the like, the glass substrate coated with multiple layers of slurry is sintered, and the glass sheet with gradient refractive indexes is obtained through a temperature control sintering process. The glass sheet is wide in refractive index regulation and control range (delta n is greater than or equal to 0.1), simple in structure and process, and suitable for large-scale production.