Display panel and preparation method thereof

The invention discloses a display panel and a preparation method thereof, and the preparation method comprises the steps: providing an array substrate which comprises a middle region and a first peripheral region arranged around the middle region; in the first peripheral area, a first retaining wall and a second retaining wall are formed on the array substrate, and the first retaining wall is located on the side, close to the middle area, of the second retaining wall; forming a light-emitting structure on the array substrate in the middle region; under shielding of the second retaining wall, a first inorganic layer, an organic layer and a second inorganic layer are sequentially stacked and deposited on the array substrate and the first retaining wall, and the first inorganic layer and the second inorganic layer are formed in an area defined by the second retaining wall; forming the organic layer in an area defined by the first retaining wall, and obtaining the display panel; wherein in the first peripheral re