The utility model provides a continuous inlet-outlet blowing system for liquid slag of a fuming furnace. The continuous inlet-outlet blowing system comprises a Kivcet furnace, a fuming furnace, a fuming furnace spray nozzle, a fuming furnace furnace-door water sleeve, a fuming furnace DCS air coal control station, a fuming furnace boiler, a fuming furnace DCS boiler control station and a steam power-generating system. The slag hole of the Kivcet furnace is used for continuously and uniformly discharging slag; the furnace-door water sleeve is equipped with high and low slag-drip openings; outlets of the high and low slag-drip openings are connected with slag-drip chutes; by virtue of height difference of the high and low slag-drip openings, not only does inlet slag of the fuming furnace flow on melt, but also the spray nozzle of the fuming furnace is guaranteed to work below liquid surface; the fuming furnace DCS air coal control station controls air coal quantity and air coal ratio; the fuming furnace DCS boiler control station realizes online stable control on three impulses of water feeding amount, evaporating amount and steam pocket water level of the fuming furnace boiler; waste heat of the high-temperature fume of the fuming furnace boiler is used for generating power by the steam power-generating system, so that heat energy is converted to electric energy. The continuous inlet-outlet blowing system disclosed by the utility model prolongs service life of equipment, relieves labor intensity, sufficiently utilizes fume waste heat and saves energy sources.