The invention relates to a semiconductor laser nasal disease diagnosing and treating device and belongs to the technical field of medical equipment. The semiconductor laser nasal disease diagnosing and treating device comprises a cylinder, a handle, a laser focus lens, a laser optical fiber connecting seat, an optical fiber clamping seat, a tail cover, zooming group lenses, a movable lens seat, a hand wheel, a beam splitter, an optical fiber head, a centered optical system, a front taper sleeve, an optical fiber light source connector, a visible light cold light source, an imaging optical system, a symmetric image converting system, a CCD charge coupling element connector, a computer and a laser. The semiconductor laser nasal disease diagnosing and treating device has the advantages of being small in size, simple in structure, cheap in price, high in converting efficiency, long in work service life and the like. According to the semiconductor laser nasal disease diagnosing and treating device, laser illumination removal is carried out under the observation of a display of the computer, the field of view is clear, operation is accurate, the successful rate is high, the operation is simple, convenient and easy to implement, anesthesia is not needed, and the thoroughness and the safety of treatment are ensured. The visible light cold light source is adopted in the semiconductor laser nasal disease diagnosing and treating device, a large-numerical-aperture optical fiber bundle serves as the transmission optical fiber, and the visual effect is better.