All-day high-sensitivity star sensor

The invention discloses an all-day high-sensitivity star sensor. The sensor comprises a light-tight hood component, a lens component and an electronic component, wherein the light-tight hood componentcomprises a two-section light-tight hood and a narrow band filter, which are used for filtering and shielding background stray light, so as to ensure that the star sensor can work normally all day; the lens component comprises a cassette telescopic unit and a gathering unit, wherein the cassette telescopic unit comprises a precise passive regulation mechanism expanding and contracting along withtemperature, at different temperatures, air space between a primary lens and a secondary lens changes, so as to compensate impact of lens face type and position change on a focal plane, and the electronic component comprises a high-sensitivity EMCCD detector and a precise regulation mechanism thereof, so as to keep coaxial with the lens component. The all-day high-sensitivity star sensor disclosedby the invention has the a