The invention discloses a noise-lowering and vortex-reducing axial flow fan. The noise-lowering and vortex-reducing axial flow fan comprises a drive motor, an impeller, an air drum and supports; blades are distributed on the impeller, and the distribution angle alpha of the blades in the peripheral direction of the impeller is equal to beta plus 5.66 sinebeta, wherein beta is the distribution angle formed when the blades are assumed to be distributed at equal intervals; a plurality of holes are formed in the parts, close to the hub and the air drum, of the rear edges of the blades. Through the design improvements of the fan efficiency, the fan noise and the service life, the noise-lowering and vortex-reducing axial flow fan has the beneficial effects that the efficiency is improved, the operation noise is lowered, the flowing condition of an inner flow field of the fan is improved, vortexes are reduced, vibration of the fan is reduced, and the service life of the fan is prolonged after the improvements.