Visual inspection device for flatness of hinge assembly

The utility model discloses a hinge assembly flatness visual inspection device which comprises a folding screen, the top of the folding screen is provided with a shell, the outer wall of the bottom of the shell is provided with a lower installation groove, the interior of the lower installation groove is connected with a light source plate through bolts, the interior of the lower installation groove is provided with a light guide plate, and the light guide plate is located at the bottom of the light source plate. An upper mounting groove is formed in the top of the shell, a battery panel is arranged in the upper mounting groove and electrically connected with the light source plate, a cover plate is hinged to the top of the shell through a shaft, a sliding groove is formed in the outer wall of the top of the cover plate, a sliding rail is connected between the inner walls of the two sides of the sliding groove through bolts, and a sliding plate is slidably connected to the outer portion of the sliding rail; p