Display device and preparation method thereof

The embodiment of the invention provides a display device and a preparation method thereof. The display device comprises a single-axis curved substrate, a flexible display assembly located on one surface of the single-axis curved substrate, a multi-axis curved substrate arranged opposite to the single-axis curved substrate, a packaging dam located on one surface of the multi-axis curved substrate and bonding glue. The surface, making contact with the multi-axis curved substrate, of the packaging dam is defined as a first surface, and the surface opposite to the first surface is defined as a second surface. The second surface is in contact with the surface, where the display assembly is formed, of the single-axis curved substrate. The curvature of the first surface is the same as that of the multi-axis curved substrate. The curvature of the second surface is the same as that of the single-axis curved substrate. A hollow cavity is defined by the packaging dam in a surrounding mode, and the display assembly is c