Display panel, preparation method thereof and display device

The invention discloses a display panel, a preparation method thereof and a display device. The display panel comprises a pixel limiting layer arranged on a substrate, wherein the pixel limiting layer comprises a separation body and a plurality of openings for accommodating sub-pixel units; a packaging layer which is arranged on the pixel limiting layer and the sub-pixel units; a color filter layer which is arranged on the packaging layer and comprises a shading layer arranged corresponding to the separators and color resistors arranged corresponding to the sub-pixel units; wherein the vertical distance between each sub-pixel unit and the substrate is gradually reduced in the direction from the edge of the sub-pixel unit to the center of the sub-pixel unit; the vertical distance between the side, close to the sub-pixel units, of the color resistor and the substrate body is gradually decreased in the direction from the edge to the center of the color resistor. According to the scheme, the light emitting effici