Flue gas treatment system

The invention relates to the technical field of flue gas emission of a power plant, in particular to a flue gas treatment system. The flue gas treatment system comprises a flue gas generating device,an indirect cooling tower (1), and a flue gas purifying unit and a chimney (6) disposed in the indirect cooling tower. The bottom of the indirect cooling tower comprises an intake structure and a radiator for heating the air at the intake structure to obtain hot air disposed at the intake structure, and the flue gas generating device is disposed outside the indirect cooling tower and is communicated with the flue gas purifying unit, so that the flue gas in the flue gas generating device enters the flue gas purifying unit for purification treatment and a clean flue is obtained, the chimney is communicated with the flue gas purification unit and extends upward along the center line of the indirect cooling tower at least to the throat of the indirect cooling tower, so that the clean flue gasis discharged into the ind