Light path of ultraviolet visible spectrophotometer

The invention discloses a light path of an ultraviolet visible spectrophotometer. The light path comprises a light source reflector for reflecting a light source into a horizontally linear light path, wherein a first reflector is arranged at the tail end of the horizontally linear light path and used for reflecting the horizontally linear light path into a 30-degree linear light path; a grating is arranged at the tail end of the 30-degree linear light path and used for reflecting the 30-degree linear light path into a 50-degree linear light path; and a second reflector is arranged at the end of the 50-degree linear light path and used for reflecting the 50-degree linear light path into a vertically linear light path vertical to the horizontally linear light path. The finally obtained vertically linear light path is a finally used light path; the light route is short, the energy loss is reduced, the energy is 5 to 10 times that of the conventional spectrophotometer, and the light spot is reduced by 4 to 5 times; the spectrophotometer can be used for analyzing 20 mu L of trace nucleic acid; and the generality is high.