The invention relates to a control method for a switch device, the switch device and a power consumption system. The method comprises the steps that input power supply parameters sent by a signal acquisition unit are received, and a preset time threshold is acquired according to power supply collection data stored when a power consumption device is powered on; analyzing is carried out according tothe input power supply parameters and the stored power supply collection data; power supply optimization data are generated and sent to an optimization processing unit; the input power supply of thepower consumption device is optimized; and the optimized input power supply is connected with the power consumption device when a switch unit is on. An external power supply during the operation of the power consumption device is monitored. The power supply optimization data are generated according to the collected input power supply parameters. The input power supply of the power consumption device is optimized. The entire operation process of the power consumption device is protected. The power consumption parameters of the power consumption device are optimized to protect the power consumption device to achieve the best power consumption environment. Compared with a traditional switch, the switch device improves the protection reliability of the power consumption device.