Since the beginning of the 21st century, more and more countries have taken the gas turbine as the preferred power for the main battle ships at sea. The gas turbine has high reliability and long service life, which meets the requirements of high-intensity and long-term offshore operations. This paper takes the physical model of the rotor of the dynamic vortex section of the marine gas turbine as the basis, combines the relevant theories, and ensures that the static characteristics of the rotor are basically unchanged in the case of modelling treatment. ANSYS software is used to carry out finite element simulation of the modelled rotor and analyse the dynamic parameters of the rotor system. At the same time, the strength of the modelled rotor is checked and calculated to verify that it meets the strength requirements.