The invention relates to a device capable of realizing getting-on and getting-off of passengers without stopping of a train when arriving at a station, comprising a main train running on a main rail and an auxiliary train running on an auxiliary rail when the passengers get on or get off the train, and the main train and the auxiliary train are provided with a docking assembly which can butt the main train with the auxiliary train, and an a passenger on / off device. The invention also relates to a railway transportation method capable of realizing getting-on and getting-off of the passengers without stopping of the train when arriving at the station. The invention has the benefits of reducing the stopping waiting time, and the time excessively consumed by train deceleration and starting acceleration relative to train running with constant velocity, saves the total running time, and has remarkable effects; furthermore, the method is applicable to various passenger trains such as ordinary trains, motor train units and the like. In addition, the main train has high power and large load, and consumes a great amount of energy in the deceleration and the starting acceleration processes; the auxiliary train has low power and light load, carries the passengers to get on and get off the main train, replaces the deceleration and the starting acceleration processes of the main train, therefore, the energy consumption is remarkably reduced.