The invention discloses a control method for an air conditioner. The control method for the air conditioner comprises the following steps: after the air conditioner enters a super-cooling preventing mode, obtaining an indoor environment temperature; while the indoor environment temperature is smaller than a cooling threshold value, obtaining operation of detecting whether the temperature is reduced or not; and while detecting the temperature reducing operation, cooling the cooling threshold value and controlling the air conditioner to perform warming-up operation. The invention further discloses a control device for the air conditioner, the air conditioner and a storage medium. After the air conditioner enters the super-cooling preventing mode, operation of detecting whether the temperature of the air conditioner is reduced or not is obtained while the indoor environment temperature is smaller than the cooling threshold value, the cooling threshold value of quick refrigerating is reduced while the temperature reducing operation is detected, and the air conditioner is controlled to warm up, so that a comfortable cooling threshold value of the user is conveniently obtained, and the cooling threshold value is prevented from being manually set by the user, and therefore, air outlet comfort of the air conditioner and user experience degree are improved.