Display panel and preparation method thereof

The invention discloses a display panel and a preparation method thereof, the display panel comprises an oxide active layer, a source electrode and a drain electrode, the oxide active layer comprises a channel region and non-channel regions located on the two sides of the channel region, and the oxide active layer comprises a first active layer and a second active layer which are sequentially stacked, the surface, close to the second active layer, of the first active layer is a rough surface, the rough surface is located in the channel region, the roughness of the rough surface is larger than or equal to 0.5 nm, and the source electrode and the drain electrode are arranged on the second active layer and located in the non-channel region. According to the invention, the surface, close to the second active layer, of the first active layer is the rough surface, and the rough surface is located in the channel region, so that the contact area of the first active layer and the second active layer is increased, the