To research the reason why the shaft-rate electric field cannot be completely eliminated and the wave curve produced by the electrostatic field in the actual measurement, a modeling method based on rotating point charge was proposed to study the corrosion electric field of ships. The Hankel transform was used to approximate the electric field generated by point charges in the three-layer medium, the curves of induced electric field changing with time, propeller radius and water surface distance under certain rotational speed were obtained, and the correctness of the theoretical results was verified by experiments. The results showed that the induced electric field is a part of the corrosion electric field of ship, and the frequency of induced electric field is the same as the speed of propeller at a certain speed, and the amplitude of that frequency decreases with the increase of the radius of propeller and the distance from the water surface.