The present disclosure discloses an optical projection imaging system and method. Through additionally installing an angle controller on a Light Emitting Diode (LED) chip, and through adjusting and controlling an emitting angle of light emitted by the LED chip every preset time period by the angle controller, different images projected in different emitting angles are obtained, and a whole image is spliced by the different images projected in the different emitting angles and projected to a projection screen. In addition, the present disclosure further discloses an optical projection imaging method.