In order to meet the needs of fisheye lens in low illumination environment, a low-light level night-vision fisheye lens applied to 2 inch low-light level night-vision camera is designed with ZEMAX. The structure includes window lens, which consists of 7 groups of 10 lenses. All of the lens are optical glasses except window lens. It is characterized by common, good performance and low cost. The effective focal length is 9.5 mm, F number is 1.8, field of view (FOV) is 170°, image height is 21 mm, the optical system total length is 90 mm, the maximum diameter is 56 mm, and the back working distance is 10.4 mm. Its modulated transfer function(MTF) in all fields is higher than 0.36 at 46 lp/mm. The absolute value of the full FOV f-θ distortion is less than 30%, the field curvature is less than 0.15 mm. The image quality of the lens is very good.