An apparatus for testing a liquid crystal display (LCD) panel which is capable of easily attaching or detaching a large polarizer to/from a test board when testing a large LCD panel, the apparatus comprising a test board for outputting light to an LCD panel which is placed thereon, a polarizer fixing unit rotatably formed at the test board and having a groove in which a polarizer is inserted, and a stop formed at the test board to fix the polarizer fixing unit to a desired position.