Precise optical device

The utility model relates to the technical field of optical devices, in particular to a precise optical device which comprises a light source, a lamp box, a box body assembly and a hollow part. The light source is arranged in the lamp box, one end of the lamp box is an open end, the box body assembly is in a barrel shape with two open ends, one end of the box body assembly is connected with the open end of the lamp box, the hollowed-out part is arranged at the other end of the box body assembly, and a transparent area and a non-transparent area are arranged on the hollowed-out part. The box body assembly arranged in the device gathers the light emitted by the light source so as to obtain a high light energy utilization rate, and the reflected light of the box body assembly can make the light irradiation of a test area using the device for testing more uniform; the hollow-out piece enables the light beam to penetrate through the transparent area of the hollow-out piece, then a bright light spot is formed in th