Optical glass and optical element

The invention provides optical glass and an optical element. The optical glass comprises following components by weight percent of oxides: 3-16% of SiO2, 2-15% of B2O3, 10-25% of sigma (SiO2 and B2O3), 38-55% of La2O3, 0-10% of Y2O3, 0-10% of Gd2O3, 45-65% of sigma (La2O3 and Y2O3 and Gd2O3), 3-15% of ZnO, 0-5% of Ta2O5, 4-10% of Nb2O5, 0-5% of TiO2, 2-10% of ZrO2, and 0-0.2% of Sb2O3, wherein SiO2 or B2O3 is greater than 1 and less than or equal to 2. The optical glass contains no oxides of alkali metal and alkaline-earth metal, such as Yb2O3, WO3, GeO2, TeO2, thorium, lead, arsenic, cadmium and mercury. The optical glass has the refractive index nd in 1.89-1.92, abbe number upsilon d in 36.5-39, specific gravity less than 5.10g/cm , glass-transition temperature lower than 680DEG C, low devitrification tendency and high transmittance, the transmittance can reach over 70% in 390nm or shorter wave length, the devitrification temperature is lower than 1150DEG C, so that the optical glass is suitable for volume production and is mainly used in digital products, cameras, liquid crystal projection and the like. The optical element is made of the optical glass.