The invention is an optical glass equipped with negatively anomalous dispersion, which belongs to the technical field of optical glass equipped with negatively anomalous dispersion and high refractive index, and resolves the problem of larger abbe coefficient and lower refractive index of the existing optical glass. The invention is composed of the following components, Sb2O3, SiO2, B2O3, Al2O3, Ta2O5, K2O, Na2O, Nb2O5, TiO2, MgO and ZrO2, wherein the contents of the above components are respectively 50-75%, 5-10%, 8-15%, 0-5%, 0-5%, 0-5%, 0-5%, 1-10%, 0-10%, 0-10%, 0-5%. The invention is equipped with bigger negatively anomalous dispersion value (PgF), high refractive index (nd) and smaller abbe coefficient (vd), wherein the refractive index value is with the range of 1.78-1.81, the abbe coefficient is with the range of 23-25, the negatively anomalous dispersion is an optical constant with the range of 0.598-0.612, and the invention is equipped with the effect of correcting the second order spectrum, perfect stability, and has no harmful compositions as plumbum, arsenium and the like, and no high price oxide .