The multifunctional carbon nanotubes involved in this invention are suitable for all high-performance composite material fields. Due to the various functions of the carbon nanotubes involved in this invention, such as reinforcement, dispersion, interfacial bonding, and curing, the carbon nanotube/epoxy resin composites produced from them have the advantages of high strength, high modulus, good toughness, low density, and conductivity inherent to carbon nanotubes themselves. They can be widely applied in various advanced material fields, with a very promising market prospect. These multifunctional carbon nanotubes are solid materials, which are very convenient to store and transport. Moreover, they inherently possess good dispersibility and interfacial bonding properties, making the operating process simple and potentially reducing production costs. Therefore, this invention provides a new approach for the industrial production of high-performance nanocomposites.