The invention discloses a display panel and a preparation method thereof. The display panel comprises a substrate; a plurality of light emitting units arranged on the substrate; quarter-wave plates which are arranged on the plurality of substrates and cover the plurality of light emitting units; linear polarization layers which are arranged on the quarter-wave plates; wherein each linear polarization layer comprises a plurality of linear polarization blocks, and each linear polarization block is correspondingly arranged between the adjacent light emitting units. In this way, light loss emittedby the display panel can be reduced, and the light-emitting brightness of the display panel is greatly improved.