Axial-flow heat-dissipation fan

An axial-flow heat dissipation fan, comprising:

• a frame, having an air inlet and an air outlet;
• a hub, rotatably arranged in the frame;
• and
• a plurality of blades, disposed at side of the hub respectively and rotate along with the hub, wherein each of the blades has a front surface facing toward the air inlet and a rear surface facing toward the air outlet, and a surface roughness of the front surface is different from a surface roughness of the rear surface, wherein the front surface is made smooth relative to the rear surface and the rear surface has at least one rough area, such that the surface roughness of the rear surface is greater than the surface roughness of the front surface to increase an air outlet pressure of the axial-flow heat dissipation fan, wherein the rough area is made by molding, and a mold surface of the molding has an etching pattern with the etching depth of the etching pattern being 10 μm to 45 μm, the density of the etching particles of the etching pattern being 15 to 150 per centimeter, and an etched microstructure of the rough area is a corresponding pattern of the mold surface.