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 by mole percent: 7.5-41.5% of Si < 4 + >; 0-10% of B < 3 + >; 2.5%-15% of Nb < 5 + >; zr < 4 + >: 1-9%; li < + >: 0-35%; na < + >: 0-35%; k < + >: 0-35%; 0.08%-7% of Al < 3 + >; 0 to 0.2 percent of Sb < 3 + >; 0%-8% of Zn < 2 + >; the refractive index nd of the optical glass is more than 1.63, and the Abbe number upsilon d of the optical glass is more than 36. The optical glass has the advantages of good chemical stability and high hardness, can be used in various environments, and is especially suitable for vehicle-mounted lenses for intelligent driving. The optical glass provided by the invention has the advantages of small density, light glass tone and good permeability, and can meet the requirements of light weight, miniaturization, good achromatism and clear imaging of an optical system. 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百分比计，含有以下组分：Si4+：7.5-41.5％；B3+：0-10％；Nb5+：2.