The invention provides a denitration system and a method which are capable of realizing direct utilization of agglomerate heat energy. The denitration system comprises a sintering machine, a cooling equipment, a waste heat recycling device, a dry desulfurization device, a dust collector, a blower fan, a denitration reactor, and a chimney; an exhaust gas outlet of an air bellow of the sintering machine is connected with an exhaust gas outlet of a first segment air bellow and an exhaust gas outlet of a second segment air bellow; the exhaust gas outlet of the first segment air bellow and the exhaust gas outlet of the second segment air bellow are connected with the waste heat recycling device, and then the waste heat recycling device is connected with the dry desulfurization device, the dust collector, the blower fan, and the chimney via pipelines in series connection successively; when the denitration reactor is a low-temperature denitration reactor, the denitration reactor is arranged between the blower fan and the chimney; and when the denitration reactor is a middle-temperature denitration reactor, the denitration reactor is arranged among the exhaust gas outlet of the first segment air bellow, the exhaust gas outlet of the second segment air bellow, and the waste heat recycling device. The denitration system and the method are capable of realizing direct utilization of agglomerate heat energy, low temperature denitration reaction of sintering exhaust gas is realized without consumption of extra energy, high efficiency conversion of NOx is realized, denitration rate is as high as 80 to 90%, agglomerate embrittlement is not caused, and agglomerate waste heat is recycled.