Display panel and preparation method of display device

The invention provides a display panel and a preparation method of a display device. The display panel comprises an array substrate layer; the display function layer is arranged on the array substrate layer; the first inorganic packaging layer is arranged on one side, deviating from the array substrate layer, of the display function layer; the composite barrier layer is arranged on the side, away from the display function layer, of the first inorganic packaging layer and comprises a substrate; the viscosity reducing adhesive layer is arranged between the substrate and the first inorganic packaging layer; the second inorganic packaging layer is arranged between the viscosity reducing adhesive layer and the first inorganic packaging layer; and the organic adhesive layer is arranged between the second inorganic packaging layer and the first inorganic packaging layer. The second inorganic packaging layer and the organic packaging layer are firstly prepared on the substrate comprising the viscosity reducing adhesi