Disclosed are an array substrate of a thin-film transistor liquid crystal display device and a method for manufacturing the same. The array substrate includes a plurality of data lines, a plurality of dummy data lines, a plurality of first gate lines, a plurality of second gate lines, and a plurality of groups of pixel units. Each group of pixel units includes an odd-numbered column of first thin film transistors and an even-numbered column of second thin film transistors. First ends and second ends of the dummy data lines are connected respectively to two common voltage electrode lines, which are arranged on the substrate in a transverse direction. The method includes steps of: forming a plurality of gate lines and two common voltage electrode lines; forming a source, a drain, and a plurality of data lines; and forming a plurality of pixel electrodes and a plurality of dummy data lines. A light shielding electrode line provided has good voltage driving uniformity.