The invention provides a thorough treatment system for sintering/pelletizing wet-desulphurization flue gases and belongs to the technical field of environmental engineering. The thorough treatment system comprises a middle flue, a guide plate, a system inlet, an air flow uniform plate, a bundle-type dust and mist removing device, a honeycomb-type dust and mist removing device, a system flue gas outlet, a backwash water device and a backwash water drainage outlet; the guide plate and the air flow uniform plate are respectively mounted in the middle flue and the system so as to change flow direction of the flue gases and uniform distribution of the flue gases in the bundle-type dust and mist removing device and the honeycomb-type dust and mist removing device; the bundle-type dust and mist removing device is connected with the honeycomb-type dust and mist removing device, a traditional wet electric dust controller is substituted, on-off state of the honeycomb-type dust and mist removing device can be regulated any time according to velocity of the flue gases, and energy consumption is greatly reduced. By the arrangement, problems about sintering and pelletizing wet-desulphurization flue gas trailing and that the traditional wet electric dust controller is prone to scaling, corrosion, pulverization, high energy consumption and the like in iron and steel industry are solved.