An apparatus for automatically displaying a grade of a liquid crystal display device and operating method thereof, includes a grade determining unit of a liquid crystal display panel; a grade inputting unit for inputting the grade of the liquid crystal display panel whose grade has been determined in the grade determining unit; a grade discriminating unit for transferring the grade of a corresponding liquid crystal display panel based upon receiving data input to the grade inputting unit; a storing unit having a grade displaying unit for classifying the graded liquid crystal display panels according to grades and storing the grades; and a robot driving unit for transferring the liquid crystal display panel to the storing unit according to instructions from the grade discriminating unit.