The treatment process of hazardous waste incineration flue gas is "waste heat recovery+rapid cooling+dry deacidification+activated carbon injection+bag dust removal+wet washing+flue gas heating". The 1100 ℃ flue gas from the secondary combustion chamber enters the waste heat boiler for waste heat recovery and SNCR denitrification. The waste heat recovered from the boiler generates steam, with a small portion for self use and the vast majority sent to the steam turbine generator unit for power generation. After the flue gas temperature drops to 550 ℃, it enters the quench tower through the flue gas duct. The flue gas is quenched to below 200 ℃ through water mist spraying within 1 second. After quenching, the flue gas enters the dry reaction tower, where activated carbon and hydrated lime powder are sprayed to remove acidic gases, heavy metals, and dioxins from the flue gas. After that, the flue gas enters the bag filter for particulate matter filtration, and then enters the wet process deacidification system to further remove acidic substances, dust, and heavy metals, After that, the flue gas enters the GGH heat exchanger, and the net flue gas after heat exchange is heated to 130 ℃ by the SGH heater. After meeting the emission standards, it is discharged into the atmosphere through the induced draft fan and chimney.