A rail vehicle comprising a vehicle body and a lighting device, wherein, the lighting device comprises a lighting fixture having a shape matching with a shape of an irregular interior decoration; characterized in that the irregular interior decoration has a wavy shape having ups and downs in a horizontal direction and/or a vertical direction; wherein the lighting fixture comprises a plurality of short lighting fixtures that are assembled into a long lighting fixture having a shape matching with the shape of the irregular interior decoration; each of the short lighting fixtures is provided with a section body, a light source is provided on the section body, the lighting fixture comprises a plurality of light sources, and the section body is twisted such that included angles between each of the light sources and a horizontal plane are consistent; each of the short lighting fixtures is fixed with an L-shaped mounting sheet through a first mounting clasp seat, and the L-shaped mounting sheet is fixed with the irregular interior decoration; a gasket is provided between the L-shaped mounting sheet and the irregular interior decoration, and a thickness of the gasket is adjusted, such that distances between each of the light sources and a top plate of a vehicle body are the same; or the lighting fixture comprises a lamp tube portion and a lamp body portion; the lamp tube portion comprises a lamp tube section, which, after being stretched and molded, has a shape matching with a shape of the irregular interior decoration; a light source is provided on the lamp tube section, and the lamp tube section is twisted and molded such that included angles between each of the light source and a horizontal plane are consistent; the lamp tube portion is fixed with the lamp body portion through a second mounting clasp seat, and the lamp body portion is fixed with the irregular interior decoration; a height of the second mounting clasp seat is adjusted, such that the distances between each of the light source and the top plate of the vehicle body are the same. a vehicle body and a lighting device, wherein, the lighting device comprises a lighting fixture having a shape matching with a shape of an irregular interior decoration; characterized in that the irregular interior decoration has a wavy shape having ups and downs in a horizontal direction and/or a vertical direction; wherein the lighting fixture comprises a plurality of short lighting fixtures that are assembled into a long lighting fixture having a shape matching with the shape of the irregular interior decoration; each of the short lighting fixtures is provided with a section body, a light source is provided on the section body, the lighting fixture comprises a plurality of light sources, and the section body is twisted such that included angles between each of the light sources and a horizontal plane are consistent; each of the short lighting fixtures is fixed with an L-shaped mounting sheet through a first mounting clasp seat, and the L-shaped mounting sheet is fixed with the irregular interior decoration; a gasket is provided between the L-shaped mounting sheet and the irregular interior decoration, and a thickness of the gasket is adjusted, such that distances between each of the light sources and a top plate of a vehicle body are the same; or the lighting fixture comprises a lamp tube portion and a lamp body portion; the lamp tube portion comprises a lamp tube section, which, after being stretched and molded, has a shape matching with a shape of the irregular interior decoration; a light source is provided on the lamp tube section, and the lamp tube section is twisted and molded such that included angles between each of the light source and a horizontal plane are consistent; the lamp tube portion is fixed with the lamp body portion through a second mounting clasp seat, and the lamp body portion is fixed with the irregular interior decoration; a height of the second mounting clasp seat is adjusted, such that the distances between each of the light source and the top plate of the vehicle body are the same.