The invention discloses a vehicle body device, and belongs to the the field of vehicle body devices. The vehicle body device comprises a ring-shaped side wall and a baseplate; an in-out hole is formed in the ring-shaped side wall; a baffle plate is arranged at the in-out hole part; the baffle plate moves up and down vertically through a strip-shaped groove in the baseplate. Through the utilization that a vehicle door is opened or closed by vertically moving up and down along the baseplate, a cargo door can be opened easily in a space in which only the vehicle can be accommodated; meanwhile, a plurality of in-out holes can be formed in the ring-shaped side wall, so that quick loading or unloading of cargoes are facilitated to save time; problems that the cargo door can not be opened in a rotating manner in a narrow place is overcome.