The present invention provides a manufacture method of an IPS TFT-LCD array substrate and an IPS TFT-LCD array substrate. In the manufacture method of the IPS TFT-LCD array substrate, the common electrode line and the gate are manufactured with the same metal layer, and the pixel electrode and the drain are manufactured with the same metal layer, and the via is formed in the insulation protective layer and the gate isolation layer correspondingly above the common electrode line; in the TFT array substrate, the pixel electrode and the drain are manufactured with the same metal layer, and the common electrode line and the gate are manufactured with the same metal layer, and the common electrode is transparent conductive material and located on the insulation protective layer, and the common electrode contact with the common electrode line through the via in the insulation protective layer and the gate isolation layer.