Display panel, preparation method thereof and display device

The invention provides a display panel, a preparation method thereof and a display device, and solves the problem of how to improve the yield of OLED (Organic Light Emitting Diode) display products in the prior art. The display panel comprises: a substrate; the isolation structure is located on the substrate, and a plurality of isolation openings are defined by the isolation structure; the light-emitting device is located in the isolation opening, and the light-emitting device comprises a light-emitting structure and a first electrode located on the side, away from the substrate, of the light-emitting structure; wherein the edge of the orthographic projection of the isolation opening on the substrate is a closed graph enclosed by an arc line. 本申请提供了一种显示面板及其制备方法、显示装置，解决了现有技术中如何提升OLED显示产品的良率的问题。其中，显示面板包括：基板；隔离结构，位于基板上，隔离结构围合出多个隔离开口；以及发光器件，位于隔离开口内，发光器件包括发光结构和位于发光结构远离基板一侧的第一电极；其中，隔离开口在基板上的正投影的边缘为弧线围合成的封闭图形。