In order to meet the need of integral layout of motor maintenance line, a new structure scheme of the traction motor rotor dismantling machine was put forward.Taking rotor out horizontally from the motor by extracting device, the rotor was given to the other side conveyor for maintenance. The extraction equipment lifting, rotating and angle adjustment, walking were driven by hydraulic system. The modal analysis was carried out on the dismantling machine frame by using finite element analysis software ANSYS. The natural frequency and vibration mode were obtained.It provides theory basis for the development of dismantling machine.The practice shows that the developed prototype can adapt to transfer requirements of traction motor centralized maintenance.