Abstract: [Objectives] To study the preparation and performance of high-performance electromagnetic shielding materials for electronic equipment in marine environment. [Methods] The surface morphology, phase composition, electrical conductivity and ferromagnetic properties of the original FeSiCr powder and coated FeSiCr@Ag were analyzed by scanning electron microscope, X-ray diffractometer, four probe and vibrating sample magnetometer and the vector network analyzer was used to test the S parameter of the sample. The salt spray test chamber was used to simulate the corrosion behavior of the coating working in the marine environment and observe its macro and micro morphology. Meanwhile, the electrochemical workstation was used to monitor the corrosion behavior of the coating in the mass fraction of 3.5%NaCl solution and study its corrosion mechanism. [Results] The results showed that the silver plating layer was compact and complete with the increase of AgNO3 addition. After electroless silver plating, the conductivity can reach 586.79S /cm, and the X-band shielding efficiency is up to 80 dB. After 96 h of accelerated corrosion in humid heat and high salt spray environment, the surface of the resin coating prepared by FeSiCr@Ag has no corrosion phenomenon. The self-corrosion potential of the coating before and after electroless silver plating is -0.4 V and -0.09V respectively, indicating that the penetration rate of the corrosive medium into the coating slows down after silver plating, and good corrosion inhibition effect is achieved. [Conclusions] The modified silver-coated ferrosilicon chromium material has high efficiency electromagnetic shielding performance and good corrosion resistance.