The invention provides a flue gas centralized treatment device applied to a tamping coal charging coke pusher. The device is integrally arranged on the side, in butt joint with the furnace body, of aSCP all-in-one machine, and comprises a coal charging smoke dust collection pipeline, a detachable coal charging furnace opening smoke collection cover, a coal charging pipeline valve plate, a coke pushing smoke dust collection pipeline, a coke pushing pipeline valve plate, a coke pushing collection cover, a door cleaning smoke dust collection pipeline, a door cleaning pipeline valve plate, a smoke dust collection main pipeline, a collection main pipeline valve plate, air plates and a ground dust removal pipeline; smoke and dust are collected in a segmented mode through an area formed after the multiple air plates are fixed, and meanwhile it is avoided that external natural air influences the area in front of the furnace. Then the smoke collection cover is adopted to collect the flue gas,so that the SCP all-in-one machine collects the amount of smoke at a furnace mouth in the processes of coaling, coke pushing, door cleaning, car moving and coal cake cutting; the environmental protection level of the whole SCP all-in-one machine is improved, and the market competitiveness and economic benefits of group company products are remarkably enhanced.