Springback-preventing high-speed train model accelerating device based on momentum transferring

The invention discloses a springback-preventing high-speed train model accelerating device based on momentum transferring. The train model accelerating device comprises experiment tracks and trailer tracks which are arranged in parallel and spaced for an appropriate distance to the experiment tracks, wherein the experiment tracks are used for running a train model; the trailer tracks are used for running a trailer which can drive the train model to run; the trailer is accelerated in a traction way by a piston mechanism; the piston mechanism comprises a traction rope, a pipeline, as well as a sliding piston and a traction piston which are arranged inside the pipeline; the sliding piston is provided with a through hole in the axial direction; one end of the traction rope is connected with a train, while the other end of the traction rope penetrates through the through hole of the sliding piston and is connected with the traction piston; the pipeline comprises an acceleration pipe section and a deceleration pipeline section; the acceleration pipe section is provided with an inlet for inletting compressed gas; and the start end of the deceleration pipeline section is provided with more than one gas leakage hole. The train model accelerating device is applicable for accelerating the train model with weight up to tens of kg to the speed being over 300km/h, and the shape of the train is free from any restriction.