The synthesis, crystal structure, and characterization of the noncentrosymmetric semiorganic material (NH4)center dot SrL-(+)-C4H2O6 center dot B(OH)(2)center dot 4H(2)O were reported. Crystals were synthesized through slow evaporation at room temperature, utilizing SrCl2 center dot 6H(2)O, C4H4O6, H3BO3, and NH3, H2O as reagents, and its structure was determined by single-crystal X-ray diffraction. It crystallizes in the triclinic space group P1 (No. 1) with a=6.4633(10) angstrom, b=7.0452(13) angstrom, c = 7.0745(12) angstrom, alpha = 85.351(5), beta = 77.678(5), gamma = 73.276(4), and Z=1. It exhibits a two-dimensional layered structure along the c axis, consisting of SrO9 polyhedra, BO4 tetrahedra, tartrate molecules, NH4 cations, and H2O molecules. IR spectroscopy, UV-vis diffuse-reflectance spectroscopy, thermal analysis, and second-harmonic generation (SHG) were also performed on the reported material. Nonlinear optical measurements, using 1064 nm radiation, indicate that the material has SHG properties, with an efficiency of approximately 1.5 times that of KH2PO4.