A ventilation control method for a laundry device, which method is aimed at solving the problems of bacteria being prone to breeding and peculiar smells being easily generated, after clothes are washed in an existing laundry device, due to the extremely moist interior of a drum assembly thereof, and subsequently washed clothes being subjected to secondary pollution. In this regard, when an air intake fan (8) is started, the present current of the air intake fan (8) is acquired; if the present current of the air intake fan (8) reaches a pre-set current value, water is injected into a water intake pipe, so as to trigger a siphoning apparatus to discharge water from the water intake pipe, and a drum assembly is then ventilated; and if the present current of the air intake fan (8) does not reach the pre-set current value, the drum assembly is directly ventilated. After clothes are washed, residual water inside a drum assembly can be air-dried, such that the breeding of bacteria and the generation of peculiar smells are prevented, and clothes are not subjected to secondary pollution during subsequent washes, thereby improving the user experience.