In order to improve the ability of the star sensor to detect the limit magnitude, a complex double-Gaussian structure optical lens is designed through selection of models and parameter calculation in this paper. After optimized by ZEMAX software, a refraction optical lens without vareing composed of 12 spherical lenses is finally obtained. The lens has an entry pupil diameter of 125 mm, a system focal length of 200 mm, a full field angle 2ω of 14.84°, and a spectrum range of 500-800 nm. The design results at a temperature of 20 ℃ show that the root mean square dispersion spot radius is less than 3.5, the full field optical design modulation transfer function (MTF) is more than 0.7 at 60 lp/mm, the energy concentration in 3×3 pixels is more than 90%, the distortion is less than 1%, and the maximum magnification chromatic aberration is 1.6. After processing and adjustment, the lowest laboratory static MTF of the measured optical system at 60 lp/mm is 0.324.