The invention discloses a design optimization method of blisk electrolytic preliminary molding machining path parameters, and belongs to the technical field of electrolytic machining. When electrolytic preliminary molding machining is provided with a plurality of blisks with characteristic sections, the machining path parameters are optimized through a UG software, the design of the blisk electrolytic preliminary molding machining path parameters can be completed quickly, the obtained path parameters can make an actual section contour curve cover all designed section characteristic curves uniformly and make machining allowance distributed in different positions more uniform, the design problem of the blisk machining path parameters is solved, subsequent machining is convenient, machining efficiency is improved, and the quality of machined products is guaranteed.