The invention discloses a preparation method for 9,9-diaryl thiophene xanthene-10,10-dioxide, and belongs to the field of fine organic synthesis and organic semiconductor material preparation. The preparation method comprises the following steps: using diphenylsulphone as a starting material and tetrahydro furan as a solvent, conducting ortho metalation reaction on diphenylsulphone under the action of n-butyllithium within a temperature range of -78-0 DEG C to obtain a corresponding aryl lithium salt; allowing the aryl lithium salt to react with an added aryl formic ether ester derivative, and performing hydrolysis to obtain a corresponding tertiary alcohol; dissolving the tertiary alcohol and electron-rich aromatic with an acetate or methylene chloride solution, using Lewis acid as a catalyst, and carrying out friedel-crafts reaction to obtain the 9,9-diaryl thiophene xanthene-10,10-dioxide. The preparation method has the advantages that the reactions are easy to control, the operation is simple, the cost is low, the repeatability is good, the productivity is high, and the product quality is high; an organic modular unit and an organic functional semiconductor can be conveniently made; the 9,9-diaryl thiophene xanthene-10,10-dioxide is used in the fields of organic light emitting diodes, organic transistors, organic laser, and organic nonlinear optics, and the like.