Display panel, preparation method thereof and spliced display panel

The invention relates to a display panel, a preparation method thereof and a spliced display panel. According to the invention, the protective layer is arranged on the second reflecting layer, and the hardness of the protective layer is greater than that of the second reflecting layer, so that the high-hardness protective layer can protect the windowing edges of the second reflecting layer and the first reflecting layer during developing treatment and prevent the windowing edges of the second reflecting layer and the first reflecting layer from being washed away by the developing solution; therefore, irregular windowing is avoided, and the welding precision of the light-emitting element is improved. 本发明涉及一种显示面板及其制备方法、拼接显示面板。本发明在第二反射层上设置保护层，保护层的硬度大于第二反射层的硬度，进而在显影处理时，高硬度的保护层可以保护第二反射层和第一反射层的开窗边缘，防止第二反射层和第一反射层的开窗边缘被显影液冲刷掉，进而避免形成不规则的开窗，进而提升发光元件的焊接精度。