The present invention discloses a liquid crystal display device, the liquid crystal display device comprises a liquid crystal panel, a side board, a plastic housing, a front frame and a least one fastening unit. The plastic housing or the front frame is formed with a fastening hole, and a fastening block is provided and embedded into the fastening hole and fixed on the side board. Thus, the plastic housing or the front frame can be tightly installed on the side board. The assembly convenience can be increased, and the engagement relationship between components of the module also can be strengthened, so as to increase the structural strength of the module.