An atomizing generator, a clothing treatment device, and a control method therefor to solve the problems of the structural complexity and poor liquid level measurement accuracy of existing atomizing generators. The atomizing generator includes an outer shell and an atomizing module, an atomization cavity capable of accommodating liquid being disposed in the outer shell, and a liquid inlet, an air inlet, and a mist outlet in communication with the atomization cavity being arranged on the outer shell, the atomizing module including an ultrasonic atomizing sheet, and the atomizing module being arranged to be capable of atomizing the liquid in the atomization cavity by vibration of the ultrasonic atomizing sheet and detecting the height of the liquid level in the atomization cavity by the vibration, which simplifies the structure of the atomizing generator and increases the precision and accuracy of liquid level measurement.