Novel low-temperature SCR denitration device

The utility model relates to the technical field of flue gas treatment accessory devices, in particular to a novel low-temperature SCR (Selective Catalytic Reduction) denitration device which can ensure a flue gas denitration effect when the temperature of flue gas is low. Meanwhile, aggravation of sulfide pollution of the flue gas in the denitration process can be avoided; in addition, liquid ammonia can be preheated to a certain extent, and the situation that flue gas purification is affected due to the too low liquid ammonia temperature is avoided; the device comprises a boiler, a denitration box and a liquid ammonia tank, a smoke pipe is arranged in the right middle of the boiler; a denitration cavity is formed in the denitration box, the top of the left side of the denitration box communicates with a gas inlet, the right end of the flue gas pipe communicates with the gas inlet, the right side of the bottom of the denitration box communicates with a gas outlet, the bottom of the gas outlet communicates wi