To study the energy absorption and anti-climbing properties of the anti-climbing energy absorbing device based on a low-floor vehicles and improve the frontal crashworthiness of car body structure, the numerical simulation was carried out using the nonlinear transient dynamic software LS-DYNA to obtain the energy absorption properties of the expanded energy absorbing component; Then the guide rod was added on the energy absorbing device, and the influence of the geometrical parameters, such as the thickness of the wall and the induced hole on the collision properties of the energy absorbing tube were studied; Finally, combined with the low floor vehicle, the collision simulation analysis was carried out. The results showed that the anti-climbing energy absorbing device with the guide rod and the induced hole has good energy absorption and anti-climbing ability; Wall thickness has a significant influence on the interfacial force and energy absorbed, the larger the wall thickness is, the larger the collision force and absorbed energy are; It is proved that the energy absorbing device can meet the design requirements, and can provide theoretical guidance for the reasonable application of the anti-climbing energy absorbing device on the low-floor vehicle.