The invention relates to a plane mirror being capable of projecting sunlight directionally which is the usually-called Tingri mirror and belongs to the solar energy application technical field. In the device, positioning plus elevation tracking or auto-rotating plus elevation tracking is adopted; the device comprises a plane mirror, a frame with a dimension small enough to be formed at one time, an adjusting device, a positioning and guiding pipe arranged a center tower and the Tingri mirror, a positioning sensor and a control system which carries out control and error judgment according to signals produced by reflection light reaching a mirror surface of a four-quadrant photosensitive element through the positioning and guiding pipe. If the invention is adopted, as long as sunlight, no matter where the sun move, the reflection light of the Tingri mirror can always project into a collector. Due to the adoption of the positioning and guiding pipe, the positioning sensor and DCS (distributed control system), a mirror with a small area can be used, reducing the difficulty in production, installation and commissioning and thus reducing the cost significantly.