The invention discloses a method for designing the wing form of an axial impeller based on a singularity distribution method. The method comprises the following steps: S1, calculating the basic geometric and flowing parameters of a whole and each stream surface; S2, calculating the component velocities of basic wing form spine nodes on each stream surface and the positions of the spine nodes; S3, circularly finishing operation on spines on each stream surface and terminating procedures. The density function for a vortex on each wing form spine is shown in the specification, and an addition item is shown in the specification. The method is suitable for designing the wing form of the axial impeller, the vortex density function and the addition item which are suitable for designing the wing form of the axial impeller are given, calculation steps are simple, and calculation amount is small. The wing form spines of which the geometric shapes and the hydraulic performance are satisfactory can be formed by the addition item. The vortex density function can ensure that the wing form which is in uniform stream meets expected boundary conditions. A large calculation amount required by the singularity distribution method is realized by a software algorithm, the design is convenient and high in speed, and the method can effectively improve design and manufacture accuracy and adapt to industrial design and production.