Glass flatness observation frame

The utility model provides a glass flatness observation frame which comprises a base, a loading frame, a first articulated shaft, a second articulated shaft, a third articulated shaft, a fourth articulated shaft, a fifth articulated shaft, a first connecting rod, a second connecting rod and an adjusting plate, and the first articulated shaft, the second articulated shaft, the third articulated shaft, the fourth articulated shaft and the fifth articulated shaft are parallel to one another. The base and the loading frame are hinged to the first hinge shaft. One end of the first connecting rod and the loading frame are hinged to the second hinge shaft, and the other end of the first connecting rod and the adjusting plate are hinged to the third hinge shaft. The second connecting rod and the base are hinged to a fourth hinge shaft, and the other end of the second connecting rod and the adjusting plate are hinged to a fifth hinge shaft; an adjusting cylinder is further hinged to the first hinge shaft, a first nut