Embodiments of the invention provide a display panel and a preparation method thereof. The display panel comprises a mother board and a plurality of back boards which are mutually arranged and bound on the mother board; a driving lead is arranged on the mother board; a leading-out electrode and a light-emitting unit are arranged on each back board; the surface of one side, provided with the leading-out electrode and the light-emitting unit, of the back board faces the surface of one side, provide with the driving lead, of the mother board; and the leading-out electrodes on the back boards areconnected with the driving lead on the mother board. According to the display panel, the driving lead is arranged on the mother board, the leading-out electrode is arranged on each back board, and theplurality of back boards are inversely arranged on the mother board, and the leading-out electrodes are connected with the driving lead, so that the phenomenon that a leading-out wire or a through hole penetrating through the back board is arranged on the side edge of the back board or behind the back plate is avoided, the distance between the adjacent back boards is reduced to the largest extent, the non-mature side edge leading wire process and the double-sided process are also avoided, and the process implementation difficulty is reduced to the maximum extent.