The invention discloses an oxide TFT. The oxide TFT comprise a source electrode, a drain electrode, an oxide active layer, a grid insulating layer, a grid electrode and a shading layer, wherein the shading layer is formed on a substrate, the grid electrode is formed on the shading layer, the grid insulating layer covers the substrate where the grid electrode is formed, the oxide active layer is formed on the grid insulating layer, and the graphic size of the shading layer is larger than the graphic size of the grid electrode. The invention further discloses a manufacturing method of the oxide TFT, a corresponding display panel and a display device. According to the oxide TFT, the manufacturing method of the oxide TFT, the display panel and the display device, influence of the incident light on the back portion of the display panel on the property of the oxide TFT can be avoided, and stability of the oxide TFT is improved.