The invention discloses a ribbed windshield wiper metal rack surface paint spraying device which structurally comprises a hanging type conveying mechanism, a paint conveying pump, a distribution box,a paint barrel, a paint barrel base, an insulation observation window, an electric wire, a control box, a filter, an isolation plate, a rotating type exhaust fan base, a rotating type exhaust fan, a paint spraying circular disc, an electric lifting machine, a paint room and a paint pipe. The hanging type conveying mechanism penetrates through the upper end of the paint room; the isolation plate isarranged at the front end of the paint room; and back surfaces of the paint conveying pump, the distribution box, the electric wire, the control box and the filter are fixedly connected with the isolation plate. The ribbed windshield wiper metal rack surface paint spraying device provided by the invention is provided with the hanging type conveying mechanism so as to be capable of realizing assembly line type paint spraying processing on multiple metal supports and meet the requirement on factory production.