The invention relates to an electric quantity prediction method based on electric power business indexes. The method comprises the following steps: 1, electric power business indexes are constructed; 2, an index fitting model is constructed; after carrying out processing of natural increase factors and season fluctuation factors rejecting on an electric quantity sequence, fitting of the processed electric quantity sequence is conducted according to the electric power business index trend; 3, the overall electric quantity sales quantity is obtained through a backstepping method, and adjusting of season factors after linear increase rejecting is carried out; and 4, the fitting electric quantity sequence is reduced, and error analysis is carried out on the reduced electric quantity sequence; through a reduced sequence with a relatively fitting effect, the scope of electric quantity trend extrapolation is obtained. The beneficial effects are that relevance of different kinds of related industries and industry chains thereof are taken into consideration; key indexes having influences on the electric power market are screened; certainty factors such as product outputs are identified; and finally, scope prediction is carried out on the further electric quantity trend reflected by the related products in the industry chains.