The utility model provides a flue gas minimum discharge processing apparatus of thermal power plant mainly forms its characterized in that by low NOx burner, denitrification facility, low low -level (stack -gas) economizer, five electric field electrostatic precipitator of two room, the high -efficient desulfurizing tower in dan tashuan district, the combination of wet -type electrostatic precipitator: the flue gas elder generation that the thermal power plant boiler low NOx burner burning produced through low low -level (stack -gas) economizer, drops the flue -gas temperature to 95 DEG C through denitrification facility, flue gas again, detach the smoke and dust through two five electric field electrostatic precipitator of room, handle the back flue gas again through the high -efficient desulfurizing tower in the two districts of single tower, it is last, flue gas process wet -type electrostatic precipitator, desorption SO3, PM2.5 fine particle, mercury and aerosol make the fume emission reach national ultralow emission standard. The utility model is used for on thermal power plant's flue gas is handled, the effect of guaranteed atmospheric pollutants minimum discharge.