The invention discloses an axial flow fan comprising blade pressure surfaces with winglets and blade tops with blowing structures. The axial flow fan comprises a mesh enclosure, an impeller, guide blades, an inner cylinder, an outer cylinder and a motor, wherein the mesh enclosure formed by weaving of iron wires is fixed on the outer cylinder, and the impeller comprises a hub and blades. The blade top blowing structures are added on the blade tops, winglet structures are added at the tails of blade force suction surfaces, and the inner cylinder at the guide-blade-grade outer end is provided with rectangular holes, so that blade top flowing conditions can be improved, blade top leakage and vortex loss are reduced, noise generated in gaps is reduced, radially moving secondary flow is controlled, boundary layer thickness of blade surfaces is controlled, vortex noise caused by blade wakes is inhibited, vortex guide blade-grade vortex shedding frequency is decreased and outlet noise is reduced. Based on improvements on different positions of an existing axial flow fan, the axial flow fan is higher in efficiency, lower in noise and more energy saving and environment friendly.