In this paper, four subway cars are selected as experimental objects, and the finite element analysis software ANSYS is used to simulate collision simulation. On this basis, we provide three sets of data about the displacement of four trains within 0.24s. Through 3d animation of three sets of data, the whole deformation process of train body collision can be obtained intuitively and clearly. Then, from the perspective of displacement, plastic deformation and climbing status of train carriages, the paper makes a detailed analysis, which is obviously different from the motion law used in the traditional 3D animation production. The experimental results of simulation of collision animation show that the use of finite element analysis software ANSYS makes the production of 3D animation to show more details, and more efficient and convenient. 3D animation also makes the data calculated by ANSYS intuitive visualization.