A liquid crystal display device comprises a first substrate and a second substrate, wherein the first substrate is provided with a viewpoint control electrode; the second substrate is provided with acommon electrode; a plurality of pixels are formed on the second substrate under limitation of scanning lines and data lines; each pixel comprises a main pixel, a first secondary pixel and a second secondary pixel; a main pixel electrode which comprises a plurality of pixel electrode strips is arranged in each main pixel; a first secondary pixel electrode is arranged in each first secondary pixel;and a second secondary pixel electrode is arranged in each second secondary pixel. A vertical electric field is formed in a region of a pixel portion corresponding to a space between the first substrate and the second substrate, liquid crystal molecules in a liquid crystal layer deflect under the effect of the vertical electric field, the viewpoint of the liquid crystal display device in the left-right direction and/or the up-down direction is reduced, and therefore, free switching between a wide viewpoint and a narrow viewpoint in the up-down direction and/or the left-right direction is realized.