The invention discloses a method for manufacturing dentate special-shaped ceramic components by injection molding, belonging to the technical field of high-performance ceramic preparation. The methodcomprises the following steps: evenly mixing 81wt% to 90wt% of ceramic powder and 10wt% to 19wt% of organic binders by weight percentage to obtain an injection-molding mixture, injection-molding the injection-molding mixture on an injection-molding machine with the injection temperature being 175 to 195 DEG C, to obtain a green body, and de-molding within 2 minutes after the injection, so as to obtain a molded green body; and then, subjecting the molded green body to water-extraction degreasing and thermal degreasing, sintering the degreased green body at 1,350 to 1,550 DEG C, holding for 1 to4 hours and furnace-cooling to obtain the ceramic components. The invention has the advantages of high automation degree, high molding and degreasing efficiencies, even green body, high dimensional accuracy and surface smoothness of sintered products, and environment-friendly and energy-saving manufacture.