A heat dissipation fan (100, 100A), comprising: a hub; and a plurality of heat dissipation blades (120, 220, 320, 420), arranged around a periphery of the hub, wherein each of the heat dissipation blades (120, 220, 320, 420) comprises: a curved surface body (121, 221, 321), having a pressure bearing surface and a negative pressing surface opposite to the pressure bearing surface; and a flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223), connected to the curved surface body (121, 221, 321), wherein the flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223) has a concave surface (122a, 222a, 322a, 422a) and a convex surface opposite to the concave surface (122a, 222a, 322a, 422a), the concave surface (122a, 222a, 322a, 422a) is recessed in the pressure bearing surface, and the convex surface protrudes outward from the negative pressing surface, wherein the heat dissipation fan (100, 100A) is a centrifugal fan, characterized in that the heat dissipation blades (120, 220, 320, 420) comprise a first blade, a second blade, and a third blade, a depth of the flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223) of the concave surface (122a, 222a, 322a, 422a) of the first blade is less than a depth of the flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223) of the second blade, and the depth of the flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223) of the second blade is less than a depth of the flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223) of the third blade, and in that the first blade, the second blade and the third blade respectively has an entrance angle (11, 12, 13) defined between tangent lines that respectively pass through the first blade, the second blade and the third blade and tangent lines that pass through an outer circumference of the hub, the first blade, the second blade and the third blade further respectively has an exit angle (O1, O2, O3) defined between the tangents lines that respectively pass through the first blade, the second blade and the third blade and tangent lines that pass through an outer circumference defined by end edges of the first blade, the second blade and the third blade, the entrance angle and the exit angle of the first blade, the entrance angle and the exit angle of the second blade, and the entrance angle and the exit angle of the third blade are respectively different. a hub; and a plurality of heat dissipation blades (120, 220, 320, 420), arranged around a periphery of the hub, wherein each of the heat dissipation blades (120, 220, 320, 420) comprises: a curved surface body (121, 221, 321), having a pressure bearing surface and a negative pressing surface opposite to the pressure bearing surface; and a flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223), connected to the curved surface body (121, 221, 321), wherein the flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223) has a concave surface (122a, 222a, 322a, 422a) and a convex surface opposite to the concave surface (122a, 222a, 322a, 422a), the concave surface (122a, 222a, 322a, 422a) is recessed in the pressure bearing surface, and the convex surface protrudes outward from the negative pressing surface, a curved surface body (121, 221, 321), having a pressure bearing surface and a negative pressing surface opposite to the pressure bearing surface; and a flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223), connected to the curved surface body (121, 221, 321), wherein the flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223) has a concave surface (122a, 222a, 322a, 422a) and a convex surface opposite to the concave surface (122a, 222a, 322a, 422a), the concave surface (122a, 222a, 322a, 422a) is recessed in the pressure bearing surface, and the convex surface protrudes outward from the negative pressing surface, wherein the heat dissipation fan (100, 100A) is a centrifugal fan, characterized in that the heat dissipation blades (120, 220, 320, 420) comprise a first blade, a second blade, and a third blade, a depth of the flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223) of the concave surface (122a, 222a, 322a, 422a) of the first blade is less than a depth of the flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223) of the second blade, and the depth of the flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223) of the second blade is less than a depth of the flow guiding portion (122, 222, 322, 422, 1221, 1222, 1223) of the third blade, and in that the first blade, the second blade and the third blade respectively has an entrance angle (11, 12, 13) defined between tangent lines that respectively pass through the first blade, the second blade and the third blade and tangent lines that pass through an outer circumference of the hub, the first blade, the second blade and the third blade further respectively has an exit angle (O1, O2, O3) defined between the tangents lines that respectively pass through the first blade, the second blade and the third blade and tangent lines that pass through an outer circumference defined by end edges of the first blade, the second blade and the third blade, the entrance angle and the exit angle of the first blade, the entrance angle and the exit angle of the second blade, and the entrance angle and the exit angle of the third blade are respectively different.