The invention discloses an electricity control device and method. The electricity control device is applied to electricity control of household appliances. A controller is used for classifying all the connected household appliances according to the level of sensitivity to electricity connection of the household appliances; a sensor is used for determining whether a new household appliance is connected; a communication interface is used for transmitting detecting results of the sensor to the controller; the controller is also used for, when the sensor determines that the new household appliance is connected, determining the category which the new household appliance belongs to, then determining the corresponding connection priority of the household appliances of every category after the new household appliance is connected, determining the electricity consumption state change information of every household appliance of all the household appliances and determining control strategies for every household appliance. The electricity control device can dynamically generate the electricity consumption scheme of every household appliance to adjust the operational modes of the household appliances, thereby achieving reasonable and effective electricity utilization.