In order to control the denitrification of sintering flue gas in the iron and steel industry, an integral low-temperature SCR denitrification catalyst is prepared by vacuum-coated catalyst slurry by using cordierite as the base material, and the effects of catalyst slurry formulation and coating thickness on the performance of the catalyst are studied. The results show that, when the pH value of the catalyst slurry = 4.5, the slurry particle size D₅₀ ≤ 5 μm, and the thickness of the coating layer is 83 μm, the comprehensive performance of the catalyst is the best, the anti-wear mass loss rate of the catalyst is ≤ 1.2%, the denitrification rate is ≥ 95%, and the SO₂/SO₃ conversion rate is ≤ 0.19% under the flue gas condition of 160 ℃.