An array substrate and a liquid crystal display device are provided. The array substrate comprises a plurality of columns of pixel units defined by adjacent data lines; each column of pixel units includes a plurality of pixel units, each pixel unit includes a first subpixel electrode, a second subpixel electrode, a first thin film transistor, a second thin film transistor and a third thin film transistor; each pixel unit further includes: a gate line arranged between the first subpixel electrode and the second subpixel electrode; the gate line being electrically connected with a gate electrode of the first thin film transistor, a gate electrode of the second thin film transistor and a gate electrode of the third thin film transistor respectively.