A touch screen, a fabrication method thereof and a display device are provided. The method comprises: forming a touch electrode on a light emission side of a display panel after the display panel is formed; and forming an organic transparent insulation layer on the light emission side of the display panel where the touch electrode has been formed. An absolute value of a difference between a refractive index of the organic transparent insulation layer and a refractive index of the touch electrode is less than or equal to a predetermined value.