Optical glass, preparation method thereof and optical element

The invention provides optical glass, a preparation method thereof and an optical element. The optical glass comprises the following components in mol%: 5.0%-19.9% of B2O3; 5.0% to 28.0% of SiO2 (silicon dioxide); 0.05% to 11.5% of La2O3; 0% to 10.0% of Gd2O3; 3.6% to 15.0% of Y2O3; znO: 22.5% to 60.0% of ZnO; the refractive index nd of the optical glass is more than 1.78, and the Abbe number upsilond is 35-45. The optical glass provided by the invention has a relatively large positive refractive index temperature coefficient, and is combined with optical glass with a negative refractive index temperature coefficient for use, so that temperature drift in a rapid temperature change or a high-temperature environment can be effectively corrected, a focus can be fixed, and clear imaging can be kept; the lens is suitable for a vehicle-mounted camera or a projector, a copying machine, a laser printer, playing equipment and the like which can generate heat in use. 本发明提供一种光学玻璃及其制备方法和光学元件。所述光学玻璃以摩尔％计含有以下组分：B2O3：5.0％～1