The utility model relates to a rail vehicle makes technical field, especially relates to a rail vehicle wind channel roof skeleton modular structure, including the car inside ceiling panel, locate the bounding wall of car inside ceiling panel top and be used for with car connection's skeleton, the side and the frame connection of bounding wall, the car inside ceiling panel can be dismantled with the skeleton and be connected, the car inside ceiling panel forms the wind channel with the sealed cavity that the bounding wall encloses, the both sides of car inside ceiling panel are equipped with the supply -air outlet of one or more air supply in to the carriage along its length direction, the inside both sides in wind channel all are provided with along the baffle of its length direction setting, the baffle separates the wind channel for the main air duct at middle part and the static pressure wind channel corresponding with the supply -air outlet, be equipped with on the baffle and be used for the through -hole of ventilating with the main air duct. The utility model discloses the car inside ceiling panel can be dismantled with the skeleton and be connected, when the wind channel needs overhaul, can pull down the car inside ceiling panel, has satisfied the daily clean demand in wind channel for air quality in the carriage obtains improving.