Star point plate and optical filter fixing mechanism

A star point plate and optical filter fixing mechanism comprises a base, an optical filter module, a star point plate module, an optical filter module pressing ring and a star point plate module pressing ring. A through hole is formed in the center of the base, and mounting grooves are formed in the positions, at the two ends of the through hole, of the base and used for mounting the optical filter module and the star point plate module respectively; and the optical filter module pressing ring and the star point plate module pressing ring are respectively connected to the base and are respectively used for fixing the optical filter module and the star point plate module. According to the utility model, the star point plate and the optical filter are fixed by geometric constraint and are not completely fastened, but a gap is reserved, so that the deformation of the star point plate and the abrasion of the optical filter are avoided, and the service lives of the star point plate and the optical filter are prolo