The invention discloses an axial flow wind wheel and an air conditioner. The axial flow wind wheel includes a wheel hub and multiple fan blades; the multiple fan blades are spaced on the wheel hub; the fan blades have front blade edges and rear blade edges which are in forward and backward arrangement, and top blade edges connecting the outer ends of the front blade edges and the outer ends of therear blade edges; the top blade edges are provided with tangent planes inclining from the pressure surfaces of the fan blades to the suction surfaces of the fan blades; the tangent planes extend fromthe front blade edges to the rear blade edges and have inscribed edges and circumscribed edges which are respectively located on the inner and outer sides; and the inscribed edges are in concavo-convex arrangement inward and outward. Thus, leakage eddy current generated along the tip positions of the fan blades of the axial flow wind wheel can be reduced, so that eddy current can be decreased, and noise can be reduced.