The invention relates to a method for modifying a catalyst through ultrasonic atomization, belonging to the field of a catalyst material preparation technology. The method is characterized by comprising the steps of putting 10-40mL of solvent into an atomizing cup 4 of an ultrasonic atomizer 10, adding active ion or molecule-containing matter into the solvent, covering the atomizing cup 4, and carrying out ultrasonic treatment for 10min to prepare catalytic active ion or molecule-containing solution 5; putting a catalyst 2 into a cylindrical funnel 6 provided with a sand core 3, arranging the funnel at a mist outlet 7 of the atomizing cup of the ultrasonic atomizer 10, and connecting a vacuum extractor 1 with the top of the funnel; starting the ultrasonic atomizer 10, adjusting the air volume and the amount of mist, adjusting the vacuum extractor 1 to generate negative pressure, entering the active ion or molecule-containing mist into the catalyst 2 until the mist at the upper layer of the catalyst 2 can be observed, maintaining for 20-40min and then stopping the ultrasonic atomizer 10. Through modifying the catalyst with ultrasonic atomization, the amount of the used solution is less, the utilization rate is high, the operation time is short, and the active loading capacity is high; in a corresponding catalytic reaction, the reaction efficiency is improved, so that the method disclosed by the invention is a new method for modifying the catalysts.