In order to study the influence of rack railway irregularity on the rack railway engineering vehicle, the dynamic model of the rack railway engineering vehicle is established, and the simulation data are compared with the experimental data to verify the accuracy of the dynamic model. With the split and integral models respectively established for the rack railway, the influence of the rack railway modeling method is studied, and the dynamic response law of the rack railway engineering vehicle under the rack railway irregularity and different running speeds is analyzed. The results show that compared with the integral model, the split model is more accurate in simulating the dynamic characteristics of the rack railway engineering vehicle. The step irregularity of the rack railway will increase the radial impact force of the rack and gear, leading to more serious unloading of the wheelset.