The invention relates to the technical field of fluorescent porous materials, and particularly relates to a fluorescent porous material as well as a synthetic method and application thereof. A chemical formula of the fluorescent porous material disclosed by the invention is C26H16N7O9Cd2; a main ligand is 1,3,5-tri-benzene imidazolyl, an auxiliary ligand is butene diacid, and a solvent is N,N-dimethylformamide; the fluorescent porous material is prepared through a heating method of the solvent. The fluorescent porous material disclosed by the invention has simple raw materials, a preparation process is simple and easy, and the fluorescent porous material has higher heat stability and fluorescence emission property. In a process of detecting pesticide paraquat by adopting the material, thesensitivity is high, the detection selectivity is good, and the fluorescent porous material has good application prospects in the field of material science.