Taking p-aminobenzoic acid as ligand, Cobalt as center metal ion, the complex of Co(NH_2C_6H_4COO)_2·(H_2O)_4 with abundant hydrogen bonds has been synthesized. This coordination compound has been characterized by IR, UV-VIS-NIR spectroscopes and single-crystal X-ray diffraction. From its structure, we know that there is a three-dimension hydrogen bond network. Connected with the abundant H-bonds, all the molecules of Co(NH_2C_6H_4COO)_2·(H_2O)_4 form a super molecular coordination compound.