A new noncentrosymmetric vanadoborate compound, K2SrVB 5O12, is synthesized by the high temperature solution method. It crystallizes in the monoclinic space group P21 (no. 4) with lattice constants a = 6.618(3) A˚, b = 8.378(4) A˚, c = 9.974(5) A˚, β = 99.789(6)°, Z = 2. The structure consists of vanadoborate anionic layers with K+ and Sr2+ cations filling the void spaces via electrostatic interactions to form the three-dimensional network. The TG-DSC curves and the UV-Vis-NIR diffuse reflectance spectrum were measured. Band structures and density of states were calculated. The powder second harmonic generation (SHG) effect of K2SrVB5O12 is similar to that of KH2PO4 (KDP).