Flue gas pollutant ultralow emission device of coal-fired boiler

The utility model relates to the technical field of flue gas treatment, in particular to a flue gas pollutant ultralow emission device of a coal-fired boiler. The flue gas pollutant ultralow emission device of the coal-fired boiler comprises a dust removal tank, a reaction tank, a filtering mechanism, a sweeping assembly, a gas inlet assembly and a gas outlet assembly, the filtering mechanism comprises a fixing frame, a filtering net and a motor, the motor is installed on the outer wall of one end of the dust removal tank, and an output shaft of the motor penetrates through the side wall of the dust removal tank to be connected with the side wall of the fixing frame; the filter screen is installed inside the fixing frame, the cleaning assembly is installed on the inner top wall of the dust removal tank, the air inlet assembly is installed between the dust removal tank and the reaction tank, and the air outlet assembly is also installed between the dust removal tank and the reaction tank. The flue gas pollutan