Disclosed are a display panel and manufacturing method thereof and a display device. The display panel includes a first substrate, a second substrate, a chip on film, and a shading array layer. The end of the first substrate extending beyond the second substrate forms a bonding end and the chip on film is bonded onto inner side of the bonding end. The inner surface of the first substrate is provided with metal signal wires located in non-pixel area. The shading array layer is located in the non-pixel area and completely shades the wires. Because the first substrate faces the viewer and the chip on film is bonded onto the inner side of bonding end, a bezel-less design is attained. The patterned shading layer forms a pattern corresponding to the metal signal wires to shade the wires for weakening lights reaching the wires and reducing reflectiveness of wires.