A liquid crystal display (LCD) module includes a middle frame, a backplane and a light source heat sink. The light source heat sink is fixed to the backplane. The middle frame includes a horizontal wall and a vertical wall. The light source heat sink includes a vertical wall. The middle frame vertically corresponds to the light source heat sink. The vertical wall of the middle frame and the vertical wall of the light source heat sink are correspondingly configured with interoperable fastening structures. The middle frame and the light source heat sink are positioned in the vertical direction through the interoperable fastening structures to increase twisting resistance of the middle frame.