An ultrasonic generator with an adjustable ultrasonic focusing depth (h1, h2, h3), wherein the ultrasonic generator comprises a cartridge housing in which an ultrasound generation portion configured to generate ultrasound is provided, a hand piece (100, 101) in which the cartridge housing is detachably mounted, and a main shaft to which the ultrasound generation portion is coupled to move in a horizontal direction parallel to the bottom of the cartridge housing or a vertical direction perpendicular to the bottom of the cartridge housing and the main shaft includes one end coupled to the hand piece (100, 101) and another end located inside the cartridge housing, the ultrasonic generator comprising: a movable plate to which the main shaft is fixed, the movable plate being provided so as to be movable inside the hand piece (100, 101) in the vertical direction; an actuator (110, 140) configured to move the main shaft in the horizontal direction and move the movable plate in the vertical direction, wherein the actuator (110, 140) includes a first actuator provided inside the hand piece (100, 101) and configured to move the main shaft in the horizontal direction; and a second actuator configured to move the movable plate in the vertical direction; and a user interface configured to receive target values one of a horizontal movement distance and a vertical movement distance of the ultrasound generation portion and control the actuator (110, 140) to adjust a vertical position of the ultrasound generation portion depending on the target values. a cartridge housing in which an ultrasound generation portion configured to generate ultrasound is provided, a hand piece (100, 101) in which the cartridge housing is detachably mounted, and a main shaft to which the ultrasound generation portion is coupled to move in a horizontal direction parallel to the bottom of the cartridge housing or a vertical direction perpendicular to the bottom of the cartridge housing and the main shaft includes one end coupled to the hand piece (100, 101) and another end located inside the cartridge housing, the ultrasonic generator comprising: a movable plate to which the main shaft is fixed, the movable plate being provided so as to be movable inside the hand piece (100, 101) in the vertical direction; an actuator (110, 140) configured to move the main shaft in the horizontal direction and move the movable plate in the vertical direction, wherein the actuator (110, 140) includes a first actuator provided inside the hand piece (100, 101) and configured to move the main shaft in the horizontal direction; and a second actuator configured to move the movable plate in the vertical direction; and a user interface configured to receive target values one of a horizontal movement distance and a vertical movement distance of the ultrasound generation portion and control the actuator (110, 140) to adjust a vertical position of the ultrasound generation portion depending on the target values. a movable plate to which the main shaft is fixed, the movable plate being provided so as to be movable inside the hand piece (100, 101) in the vertical direction; an actuator (110, 140) configured to move the main shaft in the horizontal direction and move the movable plate in the vertical direction, wherein the actuator (110, 140) includes a first actuator provided inside the hand piece (100, 101) and configured to move the main shaft in the horizontal direction; and a second actuator configured to move the movable plate in the vertical direction; and a first actuator provided inside the hand piece (100, 101) and configured to move the main shaft in the horizontal direction; and a second actuator configured to move the movable plate in the vertical direction; and a user interface configured to receive target values one of a horizontal movement distance and a vertical movement distance of the ultrasound generation portion and control the actuator (110, 140) to adjust a vertical position of the ultrasound generation portion depending on the target values.