The invention discloses a method for extracting apple polyphenol by ethyl alcohol solvent with the assistance of pressure ultrasound. The method comprises the following steps: (a) selecting crushed and juiced apple residues as raw materials; (b) putting the apple residue into a pressure ultrasound device, adding 40%-80% ethyl alcohol solution in the pressure ultrasound device, wherein the weight ratio of the apple residue to the ethyl alcohol solution is 1 to (15-30), and the pH value is adjusted to be between 3.0 and 4.5; carrying out pressurization ultrasound treatment, wherein the treatment conditions are that the pressure range is 0.20-0.50MPa, the ultrasound frequency is 20KHz, the ultrasound power is 150W-250W, the total ultrasound treatment time is 9-20 minutes, and the working temperature is 55 DEG C-85 DEG C. After the selected ultrasound time is reached, a feed liquid is taken out, and is centrifuged, and then the solvent is recycled, and dried, thereby obtaining a crude apple polyphenol product.