Method for preparing diaryl sulfone

The invention discloses a method for preparing diaryl sulfone and particularly relates to a copper chloride promoted method for preparing diaryl sulfone. The method is characterized by comprising the following step: taking aryl sulfinate as a raw material, carrying out a desulfurization coupling reaction on aryl sulfinate in an alcohol solvent under the action of copper chloride, so as to synthesize diaryl sulfone. According to the method, any ligand is not needed, inert gas shielding is not needed, and the diaryl sulfone of which the yield is 96 percent can be obtained.