The utility model discloses a high-precision single-side/double-side platform optical lens which comprises a lens body, wherein a single-side or double-side positioning platform is arranged in a non-active region of the lens body. The high-precision single-side/double-side platform optical lens is reasonable in structure; the pitch of an optical system of a photoelectron instrument is reduced; the diameter of a light path is reduced; the luminous flux of the instrument is increased; the quality of the optical system is more effectively ensured; the positioning of the product in the instrument is stable; the whole weight of the instrument is reduced; the quality of the instrument is increased; and the applicability of the instrument is increased.