The invention relates to an array base plate, a manufacturing method of the array base plate and a display device. The array base plate comprises a substrate base plate, a gate line, a data wire, an organic film and a pixel electrode, wherein the gate line is arranged on the substrate base plate and extends along the first direction; the data wire is arranged on the substrate base plate and extends along the second direction; the gate line and the data wire are mutually crossed so as to limit the pixel region; the organic film is arranged on the gate line and the data wire and in the pixel region; the pixel electrode is arranged on the organic film and is arranged in the pixel region; the organic film positioned right above the data wire has the first thickness; the organic film positioned right under the pixel electrode has the second thickness; the first thickness is greater than the second thickness. The array base plate can reduce the power consumption; the aperture opening ratio of the pixel can be improved; the poor lap joint of the pixel electrode can be avoided, so that the goal of improving the image display is achieved.