The invention provides a cutting knife mold group of an optical sheet. The cutting knife mold group comprises a knife mold plate, an appearance cutting knife and a punching knife arranged at one end of the appearance cutting knife are fixed on the knife mold plate, the inner outline of the appearance cutting knife is consistent with the outer outline of the to-be-cut optical sheet, and the appearance cutting knife is in an inversed-T shape. The punching knife is arranged at the protruded end of the inversed-T-shaped appearance cutting knife, a through hole is formed inside the punching knife, a material receiving groove is formed in a knife mold frame inwards, and the through hole is connected with the material receiving groove through a communication groove. The cutting knife mold group has the advantages that waste material in the hole can automatically enter the material receiving groove, and the punching knife cannot be blocked. Meanwhile, the optical sheet cannot be adhered on a foam pad easily, and a process of manual secondary taking is avoided.