Abstract: The present invention discloses a projecting device without prisms. The projecting device comprises a light source for generating an incident light beam, a reflective image module comprising a plurality of reflective surfaces which can be separately controlled to generate the image-containing reflected light beam, a first lens set for concentrating the incident light beam, a reflective mirror for reflecting the incident light beam and concentrating the light beam through the first lens set onto the image module, and a second lens set installed between the light source and the reflective mirror for shortening an optical path from the light source to the reflective mirror. The optical path of the incident light beam reflected from the image module intersects a plane formed by the optical paths of the incident light beam from the light source to the reflective mirror and from the reflective mirror to the image module at one point, thus interference of the light beams is prevented.