The present invention relates to the technical field of clothing treatment, and particularly relates to an atomizing generator, a clothing treatment device, and a control method therefor. The present invention aims to solve the problems of the structural complexity and poor liquid level measurement accuracy of existing atomizing generators. To this end, the atomizing generator of the present invention comprises 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 comprising an ultrasonic atomizing sheet, and the atomizing module being arranged to be capable of atomizing the liquid in the atomization cavity by means of the vibration of the ultrasonic atomizing sheet and detecting the height of the liquid level in the atomization cavity by means of the vibration. The present invention greatly simplifies the structure of the atomizing generator and increases the precision and accuracy of liquid level measurement.