The sintering flue gas denitrification and dioxin removal catalyst Na₂SO₄ and K₂SO₄ poisoning are simulated in the lab by taking Chlorobenzene as a simulant of dioxins, and the regeneration on the poisoned catalysts is carried out by water. In addition, the physical and chemical properties of all catalysts are analyzed by methods such BET, NH₃-TPD, H₂-TPR, etc. The results show that loading Na₂SO₄ and K₂SO₄ could cause different deactivation of the catalysts. Simultaneously, the regeneration by water could restore the denitration activity of the catalysts up to more than 96% of the fresh catalyst, while the recovery of catalytic degradation chlorobenzene activity is limited. Furthermore, the Na/K ions on the catalyst surface could be removed effectively by water, while and the specific surface area, the number of acidic sites, and the reducibility of surface species of the catalysts could be also restored.