Display panel, display device and preparation method of display panel

The invention provides a display panel, a display device and a preparation method of the display panel, is applied to the field of display, and aims to solve the problems that the front surface of the display panel is scratched due to a back array process and a back circuit is difficult to narrow. The display panel comprises a substrate, a plurality of light-emitting devices, at least one first electrode group, at least one second electrode group and at least one connecting wiring group. The substrate comprises a first main surface, a second main surface and a plurality of side surfaces, at least one side surface in the plurality of side surfaces is a selected side surface, and the at least one second electrode group is arranged on the second main surface of the substrate and comprises a plurality of second electrodes which are arranged side by side and are close to the selected side surface. The second electrode comprises a first part and a second part, the second part is farther away from the selected side surface relative to the first part, and the second part is used for binding a circuit board; the ratio of the size of the second parts of the plurality of second electrodes in the second electrode group in the first direction to the size of the first parts of the plurality of second electrodes in the first direction ranges from 0.3 to 0.4.