Display panel, preparation method thereof and display device

The invention discloses a display panel, a preparation method thereof and a display device, which are used for avoiding short circuit between a first electrode and a second electrode of a light-emitting device. The display panel provided by the embodiment of the invention comprises a substrate; a plurality of light emitting devices; the light-emitting device comprises a first electrode, a light-emitting functional layer and a second electrode, a pixel definition layer; the pixel definition layer comprises a plurality of first opening areas; the first electrode, the light-emitting functional layer and the second electrode are laminated in the first opening area, and the light-emitting functional layer covers at least partial area of the surface of the side, away from the substrate, of the pixel definition layer; the partition structure is located between the pixel definition layers corresponding to the two adjacent light-emitting devices; the partition structure comprises two partition grooves which are sequen