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 display product is low in reliability is solved. The display panel is provided with a display area and a non-display area surrounding the display area. The display panel includes: a substrate; the multiple dams are located on one side of the substrate and located in the non-display area; wherein the multiple dams comprise the first dam, the second dam and the third dam, the first dam, the second dam and the third dam are sequentially arranged in the direction from the display area to the non-display area, the height of the first dam is smaller than that of the second dam, and the height of the second dam is smaller than or equal to that of the third dam. 本申请提供了一种显示面板及其制备方法、显示装置，解决了现有技术中显示产品可靠性较低的问题。其中，显示面板具有显示区和环绕显示区的非显示区；显示面板包括：基板；和多个堤坝，位于基板一侧，并位于非显示区；其中，多个堤坝包括第一堤坝、第二堤坝和第三堤坝，在由显示区指向非显示区的方向上，第一堤坝、第二堤坝和第三堤坝依次排布，第一堤坝的高度小于第二堤坝的高度，第二堤坝的高度小于或等于第三堤坝的高度。