The invention provides a solar suppression angle-free star sensor. The star sensor comprises a primary image optical system. A fixed star and solar target light enters the primary image optical systemfrom an outer light shield, generates a linearly polarized light via a polarizer; the linearly polarized light reaches a primary image diaphragm through a primary spatial light modulator to form a primary image, reaches a Leo diaphragm after continuously reaching a secondary optical system through a secondary spatial light modulator, and reaches a photoelectric detector from the Leo diaphragm through a tertiary spatial light modulator to form a secondary image on the photoelectric detector; an information processor is used for collecting and saving digital images output by the photoelectric detector; and a feedback control system is formed by the information processor, the photoelectric detector, the primary spatial light modulator, a secondary spatial light modulator and the tertiary spatial light modulator. The solar suppression angle-free star sensor can overcome the influence of structural scattered straylight entering between a semi-angular field and a solar suppression angle ofthe star sensor, and can solve the problem of image surface straylight suppression that sunlight directly enters the field angle of the star sensor.