The utility model provides a flue and ozone distribution device thereof, be responsible for including distributing, be responsible for a plurality of distribution branch pipes of perpendicular intercommunication and set up a plurality of venturi distributors on the distribution branch pipe with the distribution the cigarette backplate is kept off to fixed the setting on the spout flue gas windward side of venturi distributor. The utility model discloses the oral area that makes the venturi distributor on the distribution branch pipe is not blockked up, and the direction of venturi distributor blowout ozone and the certain contained angle of direction one -tenth that the flue gas flows, more is favorable to NO and ozone to mix.