Hybrid reinforced aluminum matrix composites can integrate the advantages of each component and exert a synergistic reinforcing effect. CNTs/SiC_p reinforced Al–Cu–Mg aluminum alloy composite was prepared by vacuum sintering process, with the mass fraction of CNTs and SiC being 0.7% and 10%, respectively. Isothermal forging at 450 ℃, 460 ℃ and 470 ℃ was carried out with high deformation degree, and the influence of isothermal forging on microstructure and mechanical properties of composite was studied. It was found that the plastic properties of hybrid reinforced aluminum matrix composites after isothermal forging were obviously improved compared with sintered ingot, and the composites after 470 ℃ isothermal forging had the best comprehensive mechanical properties than sintered ingot, with an increase of 48% in tensile strength and 260% in elongation. After isothermal forging, the flocculation and slender SiCp in the matrix arranged along the flow line, which strengthened the tensile mechanical properties of the material. The research in this paper can provide a certain theoretical support for the subsequent development and application of new high-performance aluminum matrix composites in the future.