The disclosed technology is directed to a pixel unit and a method for manufacturing the same and a liquid crystal display device. The pixel unit comprises: an array substrate; a color filter substrate; and a liquid crystal layer located between the array substrate and the color filter substrate. The pixel unit includes a displaying region and a non-displaying region in which a first electrode and a second electrode are formed on the array substrate and the color filter substrate respectively, and the rotation of molecules in the liquid crystal layer between the first electrode and the second electrode can be controlled by a vertical electrical field generated between the first electrode and the second electrode after energized to realize a normal black display mode, so that light leaking from the liquid crystal layer between the first electrode and the second electrode is prevented.