The invention discloses an electric 
precipitation energy-saving control method based on the 
coal quantity and the air quantity of a boiler. The method comprises the steps: obtaining current total coalquantity and current total air quantity of the boiler and electric precipitator outlet dust content; and calculating an 
electric field secondary current target value according to a formula II2=[(T-Ttarget) / (Tmax-Tmin)]*(II2max-II2min)+IIcoal+IIw, and adjusting the 
current electric field secondary current value of the electric precipitator to an 
electric field secondary current target value. Therefore, the total 
coal quantity of the boiler is used to replace the 
unit load to control the electric 
precipitation parameters, the control deviation caused by 
coal quality change can be overcome, andthe real-time performance is better than that of the 
unit load; meanwhile, the total air quantity of the boiler serves as a feedforward 
signal, and a 
dynamic control effect of dust in the 
unit load dynamic change process can be improved; and therefore, the 
automatic control effect of the electric precipitator can be improved, excessive 
dust emission of a power 
plant is prevented, the environment-friendly purpose is achieved, the power 
utilization rate of the power 
plant is reduced, and the energy-saving purpose is achieved. The invention further discloses an electric 
precipitation energy-saving 
control system based on the coal quantity and the air quantity of the boiler, and the beneficial effects are as mentioned above.