The invention discloses an axial flow fan comprising blades with wing-type guide plates and guide blades with bionic tail edges. The axial flow fan is characterized in that four guide plates are uniformly added on every impeller blade and are disposed at the positions as high as 25%, 50% and 75% of the height of every blade and the blade top respectively. The wing-type guide plates are obtained by keeping mean camber lines of the blades, where the guide plates are disposed, unchanged and superposing NACA four-figure wing-type thickness distribution. With the aid of the wing-type guide plates, fluid in an impeller can flow more steadily, and boundary layers are thinner, so that fan efficiency is improved, and leakage loss and vortex noise can be reduced. The guide plates at the blade tops are large in area to form complicated vortexes in blade top gaps, so that blade top leakage flow can be improved effectively. Based on three improvements, the axial flow fan is higher in efficiency and lower in noise, thereby being energy saving and environment friendly.