The utility model relates to a kitchen ventilation system, specifically speaking are kitchen ventilation unit, its characterized in that is equipped with vertical shape's exhaust pipe, and the upper end of exhaust pipe is equipped with the umbrella that keeps off the rain through the support, and the upper end is equipped with axial fan through the support in the exhaust pipe, and the lower extreme of exhaust pipe is connected with the front end of the connecting pipe of level form, is equipped with the oil trap mouth on the connecting pipe under the axial fan, is equipped with the collection oil box that seals oil trap mouth and hump connection pipe on the connecting pipe, and the rear end of connecting pipe is connected with the one end of indoor hose, the other end of indoor hose with take out range hood and export and be connected the utility model discloses under the axial fan effect, improved the effect of airing exhaust greatly on the one hand, prevents at the horizontal sitting room of cooking oil smoke cluster income to reach indoor noiseless, on the other hand prevents effectively that sleet, soil dust, toy etc. From getting into the kitchen, can also mend fresh air for the kitchen, improves operator's comfort level and healthy degree.