Display panel and preparation method thereof, display device and tiled display device

The embodiment of the invention provides a display panel and a preparation method thereof, a display device and a tiled display device, relates to the technical field of display, and is used for reducing the probability of problems such as breakage and short circuit of fan-out lines and improving the reliability of the fan-out lines. The display panel comprises a substrate, a plurality of side leads and a plurality of fan-out lines. Each side lead extends from the first surface to the second surface through the selected side surface of the substrate. The fan-out lines are located on the second surface and are arranged in parallel at intervals in the first direction, and the first direction is parallel to the second surface and the selected side surface; the fan-out line comprises a leading-out section and a binding section, one end of the leading-out section is connected with one side face lead, the other end of the leading-out section is connected with the binding section, and the binding section is configur