Static ultraviolet earth simulator is a ground calibration and accuracy testing device for ultraviolet Navigation sensor. Ultraviolet earth simulator is a new type of earth simulator with small volume, high precision. This paper introduces an optical system for a static ultraviolet earth simulator and analyzes its parameters. An optical system of static ultraviolet earth simulator with wide field of view is presented. It is composed of seven lenses. Its aperture, focal length, and field of view are respectively 10 mm, 100 mm, and Φ40°. Its distortion is less than 0.036%, its MTF value at Nyquist frequency of 50 lp/mm is higher than 0.7, RMS of its wavefront error is less than 0.037λ, and the earth angular error is less than 0.006 7°. The high precision index requirement is achieved and the imaging analysis results show that the design is a feasible scheme.