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This invention belongs to the field of copper composite material preparation technology, specifically relating to a method for preparing single-walled carbon nanotube-copper composite materials. Single-walled carbon nanotubes are prepared using a flotation catalytic method, followed by acid washing and high-temperature repair purification. Subsequently, the single-walled carbon nanotubes are subjected to mixed acid gradient oxidation, and cobalt nanoparticles are chemically deposited onto their surface. Then, an amorphous titanium dioxide coating is composited onto the modified single-walled carbon nanotubes using a sol-gel method. The composite powder is added to molten copper and mixed uniformly under ultrasonic and magnetic field-assisted stirring. Finally, the mixture is rapidly solidified and hot-drawn into copper rods using a hot-casting method under continuous magnetic field assistance to obtain the single-walled carbon nanotube-copper composite material. This method improves the dispersion and interfacial bonding strength of single-walled carbon nanotubes in the copper matrix and enables the single-walled carbon nanotubes to oriented within the copper matrix. The method is simple, and the prepared composite material exhibits excellent electrical, thermal, and mechanical properties.