The invention relates to a method for extracting purple potato pigment by using ultrasonic wave and compound enzyme, which includes steps of (1) preprocessing raw material; (2) extracting the purple potato pigment by using ultrasonic wave and compound enzyme; and (3) refining extract by using macroporous resin. By using ultrasonic wave extraction technology, the present invention accelerates diffusion speed of educt from the raw material to solution, and has characteristics high extraction efficiency, no need of high temperature low energy consumption, and greatly shortened extraction time, the enzyme has characteristics of high catalytic efficiency, strong effect specificity and mild catalytic condition, and can increase productivity, lower energy consumption, reduce pollution, simplify process when being used in industry. By combining the ultrasonic wave extraction technology and the biological enzyme technology, the invention has advantages of short extraction time, high production yield, simple process, easy control of operation, convenience for large scale industrialization production and obvious economic benefit.