A lifting type range hood comprises an upper box body and a lower box body, the lower box body is arranged on the upper box body and can do lifting motion relative to the upper box body, a draught fan is installed in the upper box body, the lower box body is provided with a
smoke inlet, the central axis L of an
impeller of the draught fan is completely located in a
vertical plane S, and the
vertical plane S is perpendicular to the plane where the
smoke inlet is located. The intersection point of the
vertical plane S and the upper edge of the
smoke inlet is B, the intersection point of the central axis of the
impeller and the plane M where the
volute cover plate located on the main air inlet side of the draught fan is located is A, the slope of the connecting line from the point A to the point B is k1 in the state that the lower box body rises to the highest position, the slope of the connecting line from the point A to the point B is k2 in the state that the lower box body descends to the lowest position, and k1-k2 is larger than or equal to 0.8. According to the lifting type range hood, the lifting
stroke is limited in a certain range through limitation of two slope difference range values, so that the range hood has enough descending
stroke and negative pressure area downward movement to ensure the oil smoke suction effect, and also has enough ascending
stroke to ensure that the size of the whole range hood is relatively small.