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 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 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 in the vertical direction; an actuator configured to move the main shaft in the horizontal direction and move the movable plate in the vertical direction, wherein the actuator includes a first actuator provided inside the hand piece 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 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 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 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 in the vertical direction; an actuator configured to move the main shaft in the horizontal direction and move the movable plate in the vertical direction, wherein the actuator includes a first actuator provided inside the hand piece 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 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 in the vertical direction; an actuator configured to move the main shaft in the horizontal direction and move the movable plate in the vertical direction, wherein the actuator includes a first actuator provided inside the hand piece 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 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 to adjust a vertical position of the ultrasound generation portion depending on the target values. <EOS>