A novel dibarium cadmium diborate, Ba2Cd(BO3)(2), has been successfully synthesized by standard solid-state reaction. Large sheet-like crystal with size up to 20mmx15mmx0.7mm has been obtained using top-seed solution growth method. Ba2Cd(BO3)(2) crystallizes in the monoclinic space group C2/m with a = 9.6305(4) angstrom, b = 5.3626(3) angstrom, c = 6.5236(2) angstrom, beta = 118.079(3)degrees, Z = 2. The crystal structure is composed of isolated BO3 triangles, CdO6 octahedra and BaO9 polyhedra. CdO6 are vertex-connected with six BO3 to form infinite (infinity)Cd(B-3)(2) layers extending in (0 0 1) plane, and two rows of Ba atoms closely occupy two side of (infinity)Cd(BO3)(2) layers to forming stoichiometric sheets. IR and transmittance spectrum of Ba2Cd(BO3)(2) were reported.