In order to explore the performance of low temperature SCR denitration catalyst for sintering flue gas, a low-temperature denitration catalyst is prepared. The SCR denitration test device is constructed in the sintering plant to optimize the research on the relationship between temperature, NH₃/NO_x molar ratio and denitration efficiency, as well as the continuous operation and regeneration status under the condition of 220 ℃ and 200 ℃. The results show that the denitration efficiency reaches 90.2% ~ 93.6% at 200 ~ 350 ℃, and the NO_x meets the ultra-low emission requirement with the increase of temperature. The denitration efficiency increases with the increase of the NH₃/NO_x molar ratio, the suitable NH₃/NO_x molar ratio is 1.0. The denitration system operates continuously and keeps stably at 220 ℃, and the catalyst performance is regenerated online at 350 ℃. The regeneration cycle is 6 000 h, and the regeneration time is 150 min. The denitration system has continuously operated for 1 200 h at 200 ℃, the catalyst is seriously blocked, and the regeneration could not restore its performance at 350 ℃. Through the composition analysis, it is inferred that the formation mechanism of the obstruction is that: the inclusions of NH₄HSO₄ can be easily formed by the original flue gas SO_x reacting with the reducing agent NH₃, and the inclusions contain charcoal powder and ferric salts that could not be decomposed at 350 ℃. Low temperature denitration catalyst is used in industrial practice, the appropriate temperature should be 220 ℃. To achieve low-temperature denitration at 200 ℃, SO_x in the flue gas should be eliminated before denitration.