The invention provides a control method for an air conditioner. The control method comprises the steps that 1, running currents of the air conditioner are detected in real time; 2, whether a current current value is smaller than a first current threshold value or not is judged, if yes, the step 3 is conducted, and if not, a compressor is stopped; 3, whether the current current value is smaller than a second current threshold value or not is judged, if yes, the step 4 is conducted, and if not, the running frequency of the compressor is decreased; 4, whether the current current value is smallerthan a third current threshold value or not is judged, if yes, the compressor continues to normally work, and if not, the compressor keeps the current running frequency and prohibits frequency increasing. According to the control method for the air conditioner, when currents are abnormal in the running process of the air conditioner, the compressor is controlled by setting a current threshold value on the running currents of the air conditioner according to the condition that an actual current value reaches the current threshold value, the protection effect on the air conditioner currents is achieved, therefore, the condition that the air conditioner is burnt out due to the fact that the currents suddenly fail is avoided, air conditioner running is guaranteed to the maximum limit when thecurrents are abnormal, and use can not be influenced for users.