The range hood is an essential electrical appliance in the family kitchen. When the range hood is running, it drives the motor to make the fan rotate at a high speed, forming a negative pressure area in a certain space above the stove. The indoor lampblack gas is sucked into the range hood. The lampblack gas is filtered through the oil screen for the first time of lampblack separation, and then enters the flue of the range hood. The lampblack gas is separated for the second time through the rotation of the turbine, The oil fume in the air cabinet is subject to centrifugal force, and the oil mist condenses into oil droplets, which are collected to the oil cup through the oil path, and the purified smoke is finally discharged along the fixed path.