An embodiment of the invention provides a display panel and a preparation method thereof, relates to the technical field of display and guarantees a uniform cell gap of a liquid crystal display panel. The display panel comprises a first substrate and a second substrate which are arranged in a cell assembly manner, wherein a metal layer, a black matrix and spacers are arranged between the first substrate and the second substrate; orthographic projection of any two of the spacers, the black matrix and the metal layer on the first substrate at least overlaps partially; the thickness sum of any spacer, the metal layer and the black matrix is identical in a position corresponding to the spacer in the direction perpendicular to the first substrate. The invention is used for preparing the display panel.