In order to achieve the uniform energy absorption of the vehicle during the collision process of the high-speed EMUs and all vehicles involved in collision energy absorption, to improve the crashworthiness of the vehicle, a new type of broaching anticlimber was designed in view of the actual application of the existing anti-climber, which could be controlled by cutting thickness and cutting stroke. By using the finite element software LS-DYNA, the effect of initial cutting thickness on the whole cutting absorption process was studied. The impact test of the anti-climber was carried out and the cushion stroke of the anti-climber was investigated, and the results were compared with the numerical analysis results. The results showed that when the initial cutting thickness was thin, the chip had a spiral shape, the crimping curvature was small, the initial peak force was low, and the cutting process was more stable. Due to the adjustable cutting stroke and thickness, the interface force could be controlled in a certain range during the collision, which was beneficial to ensure the safety of the body and crew.