Novel Fresnel lens

The utility model discloses a novel Fresnel lens, comprising a housing, a Fresnel lens main body, and pinholes. The uniform-size pinholes are distributed on a surface of the housing. The housing is connected with the Fresnel lens main body. A material the housing uses is polycarbonate. A material the Fresnel lens main body uses is high density polyethylene. First, the housing is formed, and a space area for the Fresnel lens main body is left in the middle of the housing. And then by using a principle of die post forming, the molded housing is inlayed in a die, and then encapsulation and forming are performed. The lens is convenient to install and use, and can satisfy UL and other fireproof authentication requirements. The lens is suitable for wide-angle infrared detection ranges, and manufacturing process is simple and cost is low.