The invention discloses an ultraviolet fixed star and earth simulator. The ultraviolet fixed star and earth simulator comprises a fixed star simulator body and an ultraviolet earth simulator body. The fixed star simulator body is used for simulating a constellation image from infinity, and the earth simulator body is used for simulating an ultraviolet earth image from infinity. The ultraviolet fixed star and earth simulator is installed on an ultraviolet navigation sensor through a vertical type adjusting mechanism, and the constellation image and the ultraviolet earth image are overlapped and recognized by the ultraviolet navigation sensor at the same time.