The invention relates to a manufacturing process of a variable-curvature profile and cambered front-disk multi-blade centrifugal fan impeller. The manufacturing process is simple and convenient, and has the advantages of low mold cost and production time conservation; and the manufactured impeller has good quality of parts, and can bear high rotation speed. The manufacturing process comprises thefollowing steps: (1) manufacturing avariable-curvature profile blade aluminium section, and blanks of an impeller cambered front disk and a butterfly central disk; (2) punching blade end rabbets and lines of intersection; (3) punching mortises in the blanks of the impeller cambered front disk and the butterfly central disk; and (4) inserting the blade rabbets into the mortises in the butterfly central disk and the cambered front disk, bending, riveting and shaping to obtain the impeller.