A liquid crystal display (LCD) device and a fixing structure thereof are disclosed. The LCD device comprises a backlight unit and an LCD panel. The backlight unit is fixed through a first frame disposed at a side edge thereof, and the LCD panel is fixed through a second frame disposed at side edges thereof. The first frame is provided with a snap-fitting groove mechanism, and the second frame is provided with a snap-fitting mechanism for mating with the snap-fitting groove mechanism to fix the LCD panel. Because the second frame is joined with the first frame through snap-fitting in the LCD device and the fixing structure thereof of the present disclosure, it is unnecessary to use screws for fixing purpose. This makes the assembling process simple, efficient and time-saving, so the production efficiency of the LCD device is increased and the production cost is reduced.