The invention discloses an ultrasonic wave food processing device which comprises a crank component, a driving drive plate, a connection rod component, a reciprocating component, an ultrasonic transducer, a cutting knife sleeve, an ultrasonic cutting knife, a second conveying plate, a conveying driven wheel, a conveying driving wheel, a conveying belt, a driving poking pin, a driven grooved pulley and a driven shaft. The ultrasonic transducer, the cutting knife sleeve and the ultrasonic cutting knife are installed on the reciprocating component to form a movable component, the crank component and the connection rod component drive the movable component to move up and down in a reciprocating mode, and the ultrasonic transducer generates ultrasonic waves so that cutting main motions of the ultrasonic cutting knife can be achieved; the driving drive plate, the driving poking pin and the driven grooved pulley constitute an intermittent motion mechanism, the conveying driving wheel is driven by the driven shaft to produce intermittent motions, the conveying driving wheel, the conveying belt and the conveying driven wheel constitute a feeding conveying device, and the second conveying plate is driven to carry out intermittent feeding motions. The processing device is simple and compact in structure, and convenient and reliable to manufacture and install, and facilitates popularization and application in the food processing industry.