Electrostatic precipitator is mainly composed of upper box, medium box, hopper and inlet air flow tube, frame filter bag and jetting device, the ash discharging device and other components. Containing dust gas from Duster of into wind are flow tube entered each points room ash bucket, and in ash bucket diversion device of diversion Xia, big particles of dust was separation, directly fall into ash bucket, and more fine dust uniform to entered Central box and adsorption in filter bags of outside surface Shang, clean gas through filter bags entered Shang box, and by each offline valve and row wind tube row into atmospheric.