The invention discloses an axial flow blade form. The surface of the axial flow blade form comprises a suction curved surface, a pressure curved surface, an upper curved surface and a lower curved surface, wherein the side surfaces of two cylinders cover the upper curved surface and the lower curved surface, the radii of the cylinders corresponding to the upper curved surface and the lower curved surface are separately marked as R2 and R1, and R2 is larger than R1; the side surfaces of a series of coaxial cylinders of which the radii r changing from R1 to R2 are crossed with the axial flow blade form, forming a series of crossed surfaces, and then, the series of crossed surfaces are spread along the plane so as to obtain a series of spread cross sections; and a blade inlet angle varies with the variation of the ratio value of a height ratio, and both the angle variation of the blade inlet angle and the length variation of a chord meet a cubic spline curve relationship. By improving key shape parameters (for example, the blade inlet mounting angle, the blade outlet mounting angle, the specific variation form of the chord with blade height and the like), the problem that the efficiency of the axial flow blade is low can be effectively solved.