Display panel, preparation method thereof and display device

The invention provides a display panel, a preparation method thereof and a display device. The problem that in the prior art, a conventional OLED display device is low in light emitting efficiency is solved. The display panel comprises: a substrate; the pixel definition layer is located on one side of the substrate, and a pixel opening is defined by the pixel definition layer; the light-emitting device is located in the pixel opening, and the light-emitting device comprises a reflecting electrode; the light shielding layer is stacked on the side, away from the substrate, of the pixel defining layer, and the light shielding layer surrounds the light emitting device; the light shielding layer comprises a light reflecting sub-layer and a light absorbing sub-layer which are stacked, the light reflecting sub-layer is located on the side, facing the substrate, of the light absorbing sub-layer, and the light reflecting sub-layer is used for reflecting part of light emitted by the light emitting device back to the re