The present invention provides a liquid crystal display device, the liquid crystal display device comprising an upper polarizer, a lower polarizer and a first liquid crystal cell arranged between the upper polarizer and the lower polarizer, wherein a second liquid crystal cell is further arranged between the upper polarizer and the first liquid crystal cell, the second liquid crystal cell comprising a first electrode, a second electrode and a first liquid crystal layer arranged between the first electrode and the second electrode, the first liquid crystal layer being a blue phase liquid crystal layer, the first electrode and the second electrode being used for forming a vertical electric field. The present invention can realize switching between a wide view mode and a narrow view mode of the liquid crystal display device.