The invention provides a display panel, a preparation method thereof and a
display device. The display panel comprises a substrate, an isolation structure, a first packaging layer and an
etching barrier layer, wherein the isolation structure is arranged on one side of the substrate, a plurality of isolation openings are defined by the isolation structure, and the isolation openings are used for containing at least part of the light-emitting units; the first packaging layer is arranged on the side, away from the substrate, of the light-emitting unit; the
etching barrier layer is arranged on the side, away from the substrate, of the first packaging layer. In the display panel, the first packaging layer and the light-emitting unit below are protected through the
etching barrier layer, the thickness of the first packaging layer can be reduced, the production process can be accelerated, the productivity can be released, meanwhile, the
photoresist thickness in the preparation process can be reduced, the
photoresist stripping condition is reduced, the production efficiency and the product yield are improved, and the production cost is reduced. And the
processing property of the display panel is improved.