Method for measuring complex impeller blades based on six-point iteration method and related equipment

The invention discloses a complex impeller blade measurement method based on a six-point iteration method and related equipment, and the method comprises the steps: selecting three model points at the same height on a theoretical model close to the top position of an inner ring of a model surface according to a 120-degree distribution principle; on the outer ring of the model surface, three model points are selected according to the internal and external symmetrical distribution principle, six model points are selected in total, six corresponding entity points are collected on the part, fitting iteration processing is conducted on the entity points and the model points, an entity coordinate system is established, and finally measurement of the part is completed under the entity coordinate system. According to the method, the traditional coordinate system construction mode that a surface is constructed by three points, a line is constructed by two points and a circle center is determined by one point is broken