The invention discloses a monthly electric quantity prediction method based on correction of a business expansion growth curve and season adjustment. The monthly electric quantity prediction method utilizes different modes to realize prediction of the monthly electric quantity curve of an individual user and an overall industry, and can extract the corresponding key parameters by means of the power utilization growth curve for the individual user to correct the overall business expansion growth curve of the industry so as to accurately predict the overall electric quantity of the industry. The monthly electric quantity prediction method performs empirical analysis of the monthly electric quantity prediction of the iron and steel industry in a region, and the prediction result shows that the prediction method provided by the invention can accurately predict the monthly electric quantity for the individual user and the overall industry, and guarantees the effectiveness of the prediction method.