The invention provides a high-refractivity, low-dispersivity, fine moulding optical glass, comprising SiO2:1-8wt%, B2O3:16-30wt%, La2O3:15-40wt%, Gd2O3:0-20wt%, ZnO:8-30wt%, Nb2O5:0.5-14.5wt%, WO3:0-12.5wt%, TiO2:0-9wt%, Li2O:0.5-4wt%, ZrO2:1-10 wt%, Y2O3:0-5 wt%, Yb2O3:0-5 wt%, Lu2O3:0-5 wt%, Na2O: 0-3 wt%, K2O:0-2 wt%, Al2O3:0-2 wt%, BaO:0-3 wt%, CaO:0-3 wt%, SrO:0- 3 wt%, MgO:0-3 wt%, Sb2O3:0-0.5 wt%, and SnO2:0-0.5 wt%. And the invention adopts a B2O3-SiO2-La2O3(Gd2O3)-ZnO system, and uses Nb2O5, WO3 and TiO2 in the reasonable proportion to make glass have the required optical constants and good physicochemical properties of fine moulding. And its transformation temperature (Tg) is lower than 560 deg.C. And it has no high-price Ta2O5 but has good chemical stability, able to be produced in batches and stably by single pot or continous smelting furnace, or other equipment, and suitable for low-cost and fine moulding nonspherical lenses and other optical components.