Die for Fresnel lens

The utility model relates to the technical field of injection molds, and particularly discloses a mold for a Fresnel lens, which is characterized in that the mold comprises a front mold and a rear mold which are matched with each other, a front mold core is arranged on the surface, facing the rear mold, of the front mold, and a rear mold core is arranged on the surface, facing the front mold, of the rear mold; a rear mold forming groove is formed in the surface, facing the front mold core, of the rear mold core, when the front mold and the rear mold are closed, the front mold core and the rear mold forming groove define a forming mold cavity for forming a Fresnel lens, an exhaust groove is formed in the peripheral side of the rear mold forming groove and communicates with the rear mold forming groove, and the exhaust groove is communicated with the rear mold forming groove. The groove depth range of the exhaust groove is set to be 0.008 mm to 0.012 mm. The Fresnel lens has the advantages that the plumpness of