The invention discloses an electricity consumption prediction method and device. The method comprises the steps: acquiring parameter values of key parameters influencing electricity consumption of a target area; Inputting the parameter values of the key parameters into a prediction model to obtain the predicted value of the power consumption in the target area, and optimizing the parameters of thesupport vector machine by the prediction model through a particle swarm optimization algorithm to obtain the prediction value. The power consumption prediction method and device can improve the powerconsumption prediction precision.