Texture observer and application method thereof

The invention relates to a texture observer which comprises a support, an observation platform and a strut, wherein the observation platform is arranged above the support, the strut is arranged on one side of the observation platform, a chute is formed on one side of the strut, and a camera, a first collimating lens, a second collimating lens and a light source are sequentially arranged in the chute from top to bottom by fixing blocks; the camera is connected with a display by a cable conductor, and a zoom lens is additionally arranged below the camera; and the central points of the camera, the zoom lens, the first collimating lens, the second collimating lens and the light source are on the same vertical line. According to the texture observer, by adjusting the distance between the light source and the second collimating lens and the distance between the first collimating lens and the second collimating lens as well as the light ray imaging principle, the texture or surface grain trend figure of a detected s