NOVELTY - Preparation of difenoconazole comprises carrying out acylation combining by reacting 3,4'-dichloro diphenyl ether, bromoacetyl bromide, aluminum chloride, and solvent for 5 hours at 10-15 degrees C, dropping with hydrochloric acid, and desolventizing to obtain a bromoketone; cyclizing combining by reacting the bromoketone, propylene glycol, catalytic agent p-toluenesulfonic acid, and methylbenzene, and carrying out reaction elimination to obtain a bromination ketal; condensing difenoconazole to salt; and refining.    USE - Method for the preparation of difenoconazole (claimed).    ADVANTAGE - The method has a shortened reaction time, and increased yield coefficient. It realizes the clean and environment-friendly production.    DETAILED DESCRIPTION - Preparation of difenoconazole comprises:    (A) carrying out acylation combining by reacting 3,4'-dichloro diphenyl ether, bromoacetyl bromide, aluminum chloride, and solvent for 5 hours at 10-15 degrees C, dropping with hydrochloric acid, dividing waste acid layer and solvent layer, and desolventizing to recover the solvent to obtain a bromoketone (w-bromo-2-chloro-3,4'-dichloroacetophenone ether);    (B) cyclizing combining by reacting the bromoketone, propylene glycol, catalytic agent p-toluenesulfonic acid, and methylbenzene for 4 hours at 105-110 degrees C, carrying out reaction elimination of the oil layer and methylbenzene layer to obtain a bromination ketal (3-chloro-4-(4-methyl-bromomethyl-1,3-dioxolan-2-yl) phenyl-4'chlorphenyl ether);    (C) condensing difenoconazole to salt combining step by reacting the bromination ketal, triazole sodium, dimethylbenzene, and catalytic agent potassium iodide for 4 hours at 120 degrees C, filtering, and washing with water until neutral to obtain a desolventized crude difenoconazole; and    (D) refining by adding methylbenzene to the crude difenoconazole, dropping hydrochloric acid to obtain crystal, filtering, applying a solvent, filtering slag, adding with water and methylbenzene, regulating using ammonia water, dividing the water layer, desolventizing methylbenzene, adding isopropyl alcohol to reflux, and freezing to crystallize.