The utility model discloses a photoelectric conversion energy regenerating device of a display or a light source, which comprises a cover type photoelectric cell panel which is covered on the front periphery of the display or the light source, an energy accumulating and storing unit which is connected between the cover type photoelectric cell panel and a charging management module, the charging management module is connected with an accumulator or a user device through at least one switching device, and the cover type photoelectric cell panel comprises a flat transparent photoelectric cell panel and a surrounding type photoelectric cell panel. The flat transparent photoelectric cell panel is positioned in front of the display or the light resource, and the surrounding type photoelectric cell panel surrounds the periphery of the light source. The device can recover a part of the waste light energy on the basis of not affecting the lighting needs of the users, or storing the recovered energy in the accumulator or charging the user device during the recovering process to realize the aim of saving energy.