The invention provides an anode hanging device of a horizontal wet-type electric dust collector. The anode hanging device comprises anode supporting beams symmetrically arranged on the two sides of ananode plate, and a plurality of fasteners mounted on the two anode supporting beams; the anode supporting beams adopt flat steel; chamfers are arranged at the lower ends of the side surfaces, away from the anode plate, of the flat steel; and the anode plate is fixed between the two anode supporting beams through the fasteners. With a flat steel supporting beams arranged on the anode hanging device an effective water film can be formed on the anode plate, the anode plate can be effectively cleaned, and the problem that the whole anode plate cannot be effectively cleaned due to relatively largecross sections of conventional supporting beams can be avoided; and the anode plate is fixed through the fasteners, and the anode plate is freely hung on the supporting beams, so that the perpendicularity of the anode plate can be better guaranteed, and the on-site installation and adjustment are convenient.