The utility model relates to a multiunit closes containerized traffic flatcar, including chassis, locking device, coupling buffer, arresting gear and bogie, the locking device has been arranged on thechassis, multiple specification and multiple combination container loading can be realized, coupling buffer can adapt to the hook shadoof at right side action division hook to be equipped with hook shadoof stop device, arresting gear adopts stepless empty and load automatic adjustment braking system and the worm gear formula hand arresting gear who accords with the UIC standard, the bogie adoptswelding frame type bogie, is provided with the two side brake shoe arresting gear of suspension type. The utility model discloses overall structure is reasonable, can effectively reduce the dead weight, makes the vehicle have bigger bearing capacity, can load 10ft, 20ft and 40ft container, satisfies user various combination's loading demand, simultaneously, adopt key component such as telescopic twistlock, stepless empty and load automatic adjustment braking system, right hand model automotive vehicle hook, welding bogie, improve vehicle performance index and fail safe nature by a wide margin.