Recently, using microwave devices emitting electromagnetic waves due to enhancing convenient life have been increased that can be harmful to the environment. In this study, CuFe₂O₄ nanoparticles were prepared through the conventional sol-gel procedure and then were characterized by X-ray powder diffraction (XRD), vibrating sample magnetometer (VSM), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FT-IR), and vector network analyzer (VNA) using S parameters. Results illustrated that pure crystal structure of magnetic nanoparticles has been synthesized by the sol-gel method with 26.91 emu/g magnetic saturation (M_s). Finally, CuFe₂O₄ nanoparticles were composited by silicone rubber to investigate of its microwave absorption properties. Results showed that CuFe₂O₄/silicone rubber nanocomposite absorbed more than 94.87% of microwave at ku-band frequency with 1.7 mm thickness and the maximum reflection loss was -60.38 dB at 16.1 GHz. Magnetic and dielectric properties of the CuFe₂O₄ nanoparticles and silicone rubber polymeric matrix in the nanocomposite demonstrated desirable microwave absorption properties.