Abstract: An assembly-type car body and a rail vehicle. A roof, an underframe, side roofs and side walls of the assembly-type car body are separately formed by assembling double-layer pultruded profiles, and each double-layer pultruded profile comprises an outer plate, an inner plate and cavities formed by separating an interlayer between the outer plate and the inner plate using ribs; the upper edge and the lower edge of each side roof are respectively connected to an edge of the roof and the upper edge of a side wall by means of lapping joints, and the lower edge of each side wall is connected to an edge of the underframe by means of a side wall connector; each side wall connector is a double-layer pultruded profile unit, the upper edge of the side wall connector is connected to the lower edge of the side wall by a plug joint.

Abstract: A rail vehicle body structure, comprising: a tubular corrugated plate; an annular beam and an underframe cross beam sleeved within the corrugated plate; and underframe side beams provided between the annular beam and the underframe cross beam. The two sides of the bottom of the corrugated plate are symmetrically provided with connection parts, and the underframe side beam is disposed on the outside of the connection part.