The invention discloses a control method, a control system and a control device of an air valve. The control method comprises the following steps that corresponding data of an aluminum pumping speed correlation factor are acquired; the associated factor data to be input are inputted into a pre-established target data model so as to determine the aluminum pumping speed; and the closing time of a power air source valve is determined according to the weight of a received target ladle, and the aluminum pumping speed and the speed trend determined by the target data model, so that ground control parts control the valve of the power air source to be closed at the closing moment through a wired signal. According to the control method of the air valve, the weight data are transmitted to the groundthrough a signal acquisition component arranged on the antenna in a wireless transmission mode; under the conditions of the data delay and packet loss frequently occur even in the strong-interferenceenvironment of the electrolytic workshop, the ground control component can still accurately control the valve of the power air source to be closed in time through the wired signal, so that the precision of aluminum discharge control is remarkably improved, and meanwhile, the phenomenon of the ladle overflow is avoided.