Cone-shaped wind wheel

The invention provides a cone-shaped wind wheel which can enhance effects of sucking and exhausting oily fume. The cone-shaped wind wheel comprises an upper ring, a lower ring, a plurality of fan blades and a motor shaft mounting hole. The cone-shaped wind wheel is characterized in that the external diameter of the upper ring is less than the external diameter of the lower ring, when the fan blades, the upper ring and the lower ring are assembled into a wind wheel, the centre line of each single fan blade or a straight line passing through midpoints of two ends of each single fan blade and the center axis of the wind wheel are not parallel but form a certain inclination angle Phi, the inclination angle Phi is greater than or equal to 5 degrees and less than or equal to 30 degrees, sizes of two ends of each fan blade are unequal, one end of each fan blade is larger, the other end of each fan blade is smaller, the larger end of each fan blade is connected with the lower ring, and the smaller end of each fan blade is connected with the upper ring.