This paper aims to study the corrosion trend of copper armor layer of submarine cable under induced current in simulated seawater environment. The corrosion rate of copper armor layer varying with time under different induced current densities was studied by immersion experiments. The surface morphology of copper armor after corrosion was observed by scanning electron microscopy. The products of copper armor after corrosion were analyzed by X-ray diffraction. Finally, the surface double layer structure of copper armor after corrosion was studied by AC impedance method. It can be seen from experiments that the existence of induced current could accelerate the corrosion of copper armor to a certain extent in simulated seawater environment. With the prolongation of immersion time, the corrosion rate increased first and then decreased, and gradually tended to be stable. In the peak case, the corrosion rate increased by 4~7 times; and in the stable stage, the corrosion rate increased by 3~5 times. With the increase of induction current density, the corrosion rate of copper armor increased gradually, and had a non-linear relationship with induction current density. By fitting the data, the corrosion rate was proportional to the 0.5 power of induction current density. X-ray diffraction analysis showed that the main corrosion product of copper armor in simulated seawater was Cu2O. The corrosion rate caused by induction current is about 0.16%~2.03% of the equivalent DC current corrosion rate. The induced current flowing through the copper armor mostly passes through the charging and discharging of the interface electric double layer capacitor, and no substantial corrosion reaction occurs. A small part of the induced current leads to corrosion through polarization resistance.