The invention discloses a multi-radiation evaporation screen afterheat boiler. The multi-radiation evaporation screen afterheat boiler comprises a flue gas inlet, a flue gas flow equalizing chamber, a water-cooling radiation heat exchange chamber, a radiation evaporation screen, a film type water cooling wall, a convective heat exchange chamber, an evaporator, a coal saver, a steam pocket, a dust discharging device and the like. High-temperature flue gas enters the flue gas flow equalizing chamber from a flue gas inlet of the afterheat boiler, after being equalized, the flue gas enters the water-cooling radiation heat exchange chamber, after exchanging heat with the film type water cooling wall and the radiation evaporation screen, the flue gas enters the convective heat exchange chamber again, after the flue gas exchanges heat with the evaporator and the coal saver, the temperature of the flue gas is greatly reduced, the flue gas is exhausted from a boiler system, and after being de-dusted, the flue gas is exhausted; the afterheat boiler absorbs the heat of the high-temperature flue gas, and the generated steam is used for production or generating electricity. The afterheat boiler can fully reclaim the heat of the high-temperature and high-dust content flue gas of an arc furnace, convertor and the like, the temperature of the absorbed flue gas can be up to 1,600 DEG C, and the reclaimed heat can be up to over 70 percent of the heat of the exhausted flue gas; the equipment of the reclaiming system is stable and reliable in operation, and the maintenance cost and the operation cost are low.