Kitchen smoke exhaust system

The utility model discloses a kitchen smoke exhaust system which is characterized in that the kitchen smoke exhaust system comprises an oil smoke separation device and a heat preservation box, the top of the oil smoke separation device is connected with a smoke exhaust pipe, the smoke exhaust pipe is wound around the heat preservation box, the end portion of the wound smoke exhaust pipe is connected to a flue main pipe, and a barb buckle is arranged at the end portion of the smoke exhaust pipe. The oil smoke separation device is fixedly connected to a flue main pipe through the barb buckles, and a fresh air assembly is further arranged on the side, close to the human body, of the oil smoke separation device and used for removing oil smoke on the human body. The kitchen smoke exhaust system comprises the heat preservation box and the fresh air assembly, in the cooking process, cooked meals can be placed in the heat preservation box for heat preservation, the heat preservation box conducts heat preservation thr