The invention discloses an optical fiber illumination angle adjusting device. The optical fiber illumination angle adjusting device comprises an optical fiber fixed plate, joint bearings, an optical fiber guider, an optical fiber adjusting plate, an optical fiber, an adjusting device capable of adjusting a distance from the optical fiber adjusting plate to the optical fiber fixed plate, and a guide shaft; the section length of the optical fiber adjusting plate is smaller than the section length of the optical fiber fixed plate; the optical fiber guider is of a hollow structure, and two ends thereof are connected with the optical fiber fixed plate and the optical fiber adjusting plate through the joint bearings; one end of the guide shaft is fixed on the optical fiber fixed plate; the optical fiber adjusting plate sleeves the guide shaft; and after the optical fiber is inserted in the optical fiber guider from one side of the optical fiber adjusting plate, a light outlet end thereof isfixed in the optical fiber guider. The optical fiber illumination angle adjusting device has the beneficial effects of low cost, no use limitation from places, convenience to use, no problem of nonuniform illumination in adjustment and use and no potential safety hazard; and in addition, the optical fiber illumination angle adjusting device realizes photoelectric separation, and is convenient to maintain.