The invention relates to a manufacturing method for blades, in particular to a precise cold-rolling manufacturing method for a GH2787 alloy blade. The method includes the following steps that (1) a GH2787 alloy billet is heated to 1010-1080 DEG C, extrusion forming is carried out through a high energy rate forging hammer, the deformation is 20%-60%, and a blade blank is obtained and cleaned; (2) thermal treatment is carried out, and the blade blank is subjected to solid solution treatment with the solid solution temperature ranging from 900 DEG C to 990 DEG C; (3) a blade tenon is machined, after a blade body molded surface is flattened, cold-rolling forming is carried out with the deformation being 20%-40%, and the blade is obtained; (4) solid-solution aging treatment is carried out on the blade subjected to cold-rolling through a vacuum furnace, the solid solution temperature is 900-990 DEG C, heat preservation is conducted for 1-2 h, and argon filling is carried out for cooling; the aging temperature ranges from 750 DEG C to 790 DEG C, heat preservation is conducted for 16-25 h, and argon filling is carried out for cooling; and (5) the edge of the blade is linearly cut and polished and finished. The blade obtained through the method is good in surface completeness, good in performance and capable of meeting the requirements of a blade of a high-performance engine.