To improve the crashworthiness of bridge piers，a new type of annular anti-collision box with curved-shaped made by steel-polyurethane-steel sandwich plate was proposed. Using the ANSYS / LS-DYNA software with explicit dynamic transient nonlinear, the simulation model of ship collision with pier was established. This paper analyzes the energy conversion between the ship, the anti-collision box, the rubber fender and the pier with the changes of the impact force and the speed of the ship in impact process. It also analyzed the stress and deformation of impact parts of anti-collision box. The results show that the bridge pier's annular anti-collision box with curved-shaped made by the sandwich plate can absorb 70% of the ship impact energy when the anti-collision box is unfavorably impacted, and that the anti-collision box has a saving stiffening plates and brackets, simple structure, and light weight. The study not only shows that the anti-collision box can fully play the impact property and excellent elastoplastic property of the sandwich plate itself, but also provides a theoretical basis for its engineering application.