Microwave absorbers are susceptible to strong corrosion in the marine environment, leading to significant limitations in their application. Therefore, the development of composites with stronger corrosion resistance and wave-absorbing properties is imminent. The work aims to prepare new double-layer wave-absorbing composites by Ce-ferrite/TPU composites with a 30% mass fraction of rare-earth ferrite powder as the matching layer and Ce-ferrite/TPU composites with a 70% mass fraction of rare-earth ferrite powder as the wave-absorbing layer. Among them, the preparation process of the single-layer composites is to keep the total mass of the rare-earth-doped ferrite powder and polyurethane unchanged at 12 g. The rare earth-doped ferrite powder with mass fractions of 30% and 70% was weighed, respectively, and a three-necked flask was erected. Firstly, the DMF solution was poured in and the stirring paddles were opened to raise the temperature to 80 ℃, and then the DMF solution was poured in the polyurethane (TPU), so that the DMF solution and the polyurethane (TPU), which had been previously heated to 80 ℃, were mixed in the stirring paddles. The DMF solution was fully dissolved under the stirring of the paddles for about two hours, after which the weighed rare earth-doped ferrite powder was poured in to fully react with TPU, and then the above reaction system was placed in a vacuum drying oven for the removal of bubbles and then put into the oven to dry the DMF solution, and a single-layer Ce-ferrite/TPU composite material could be obtained after the above operation.