The invention relates to a preparation method of a 1-aryl-4,4,4-trifluoro-1-butanone compound and belongs to the field of compound preparation. The preparation method is characterized by comprising the following steps of by taking trifluoromethyl-substituted enol sulfonate as a compound shown in a general formula II as a raw material, synthesizing 1-aryl-4,4,4-trifluoro-1-butanone as a compound shown in a general formula I: the formula l is shown in the description. The method provided by the invention provides a method which is convenient and is low in cost for synthesis of the 1-aryl-4,4,4-trifluoro-1-butanone compound and avoids using an expensive metal catalyst reagent.