Abstract: The present invention relates to a sunlight-collecting apparatus, comprises: a reflector panel (110) installed below a light-collecting panel (10) installed on an outer wall of a building; a supporting unit (120) configured as a fixing frame (121) coupled to each frame on the outer wall of the building to support the reflector panel (110); and an actuator unit (130) for controlling the angle of the reflector panel (110), wherein sunlight is effectively collected by the light-collecting panel (10) and reflector panel (110) to improve the efficiency of generating power from solar energy, and the angle of the reflector panel (110) installed below the light-collecting panel (110) is controlled by the actuator unit (130) to enable the more effective collection of sunlight.