The invention provides a radiation waste-heat boiler and belongs to the technical field of heat exchanging. The radiation waste-heat boiler comprises a pressure shell. The pressure shell is provided with a gas inlet and at least one gas outlet, wherein the gas inlet is used for inputting of hot gas, and the gas outlets are used for outputting gas cooled through a cooling device. The pressure shell is internally provided with the cooling device. The cooling device comprises an inner water-cooling wall, at least one pipe panel water-cooling wall is arranged in the circumferential direction of the inner layer water-cooling wall, each pipe panel water-cooling wall is composed of at least two water-cooling wall polished pipes which are connected through fins, one end of at least one pipe panel water-cooling wall is connected with the inner water-cooling wall, the other end of at least one pipe panel water-cooling wall points to the middle axis of the pressure shell, and the water-cooling wall polished pipes are parallel to the middle axis. According to the radiation waste-heat boiler, the heat exchange amount of unit space of the radiation waste-heat boiler is increased, and the equipment size is reduced.