The invention provides a liquid crystal display device. The liquid crystal display device comprises a liquid crystal panel, a backlight source and a front frame for connecting the backlight source with the liquid crystal panel. The front frame comprises transverse limiting parts and longitudinal limiting parts connected with the transverse limiting parts, wherein the longitudinal limiting parts are located on the outer side of the liquid crystal panel and surround the liquid crystal panel, the transverse limiting parts extend to the middle of the liquid crystal panel from the upper ends of the longitudinal limiting parts to be located above the light outlet face of the liquid crystal panel, the liquid crystal display device further comprises a gap adjusting mechanism, and the gap adjusting mechanism is used for adjusting gaps between the transverse limiting parts and the light outlet face of the liquid crystal panel. The gap adjusting mechanism can prevent light leakage when display in a dark state occurs and ensure that the liquid crystal panel can be firmly connected with the backlight source together in most states.