Roof structure and railway vehicle

The roof structure comprises a top plate assembly and two roof edge beams located on the two sides of the top plate assembly respectively, a mounting rib plate is connected to the bottom face of the top plate assembly, the edges of the two sides of the mounting rib plate are connected to the bottom face of the top plate assembly respectively, and a through mounting cavity is defined by the mounting rib plate and the top plate assembly; a sound insulation layer is arranged in the mounting cavity. According to the car roof structure, the mounting rib plate is connected to the bottom face of the top plate assembly, the through mounting cavity is formed in the space between the mounting rib plate and the top plate assembly, the sound insulation layer arranged in the mounting cavity facilitates the sound insulation and noise reduction effects, and transmission of noise of an air conditioning unit and electrical equipment above the top plate assembly to the interior of a car below can be reduced; and meanwhile, the