Display panel and manufacturing method thereof

The invention discloses a display panel and a manufacturing method thereof. The display panel comprises a display area and a non-display area located on the periphery of the display area, wherein thenon-display area comprises a fan-out wiring area and a signal transmission area connected with the display area and the fan-out wiring area; at least one data signal line is arranged in the signal transmission area, and the data signal line comprises a first protective layer, an electric wire layer located on the first protective layer and a second protective layer located on the electric wire layer; and the second protective layer covers at least part of the side surface of the electric wire layer. According to the invention, the second protective layer is patterned, and when the wire layer is eroded, at least part of the electric wire layer is covered by the second protective layer, so that the residue of an organic material at the eroded part of the electric wire layer in the manufacturing process is reduced, t