Spaceborne directional polarization camera is a super-wide-angle polarization and low-distortion imaging sensor.First,the working principle of the spaceborne directional polarization camera has been introduced.In order to guarantee the requirements of polarization measurement accuracy and the wide field of view imaging quality,the design difficulties of the optical system have been analyzed and finally a retro- type image side telecentric optical structure has been adopted.Due to the aberration characteristics of the optical path structure,aspheric lens has been used to correct distortion and astigmatism which improves the uniformity of the image plane illuminance.Depending on this method,ray tracing and optimization for spaceborne directional polarization camera has been used by the optical design software.The spectral range is 420~930 nm.The whole field of view angle is 118.74°.The focal length is 4.833 mm.The relative aperture is 1:4.The result shows that the modulation transfer function (MTF) of the optical system in the whole field of view is greater than 0.5@22.22 lp/mm,the maximum distortion is 0.9669% and the degree of surface unevenness of image is higher than 97%.After mounting,aligning and fabricating,the image quality of optical system completely satisfies the requirements.