Additive and subtractive composite manufacturing method for turbine runner

The invention discloses an additive and subtractive composite manufacturing method for a turbine runner. The manufacturing of a runner blade comprises the following steps: a, a blade model is imported into additive equipment according to an STL format, self-adaptive layering slicing is carried out on the model base, additive manufacturing parameters are determined, and the additive manufacturing parameters are set; b, after the setting of the additive manufacturing parameters is completed, the additive equipment utilizes a high-energy beam to manufacture all the blades to the set layer number; c, after all the blades are subjected to additive manufacturing to reach the set layer number, cutting is conducted through a cutter, all the blades are synchronously machined, redundant allowance is removed, blade deformation is corrected, and after blade correction is completed, all the blades are subjected to additive manufacturing through the high-energy beam again to reach the next set layer number; and d, all the