Method for low-cost preparation of multi-walled carbon nanotubes

The invention discloses a method for low cost preparation of multi-walled carbon nanotubes. The method adopts an industrial skilled super crosslinking polymerization reaction, a conventional solution method, solvothermal method and ultrasonic assistant method are adopted, a variety of monomers are used as reactants, a tubular super crosslinking polymer is prepared by adjusting the monomer concentration firstly, and then the tubular super crosslinking polymer as a precursor is calcined to obtain the multi-walled carbon nanotubes having large specific surface area. The method has no need for special reaction equipment, expensive catalysts and special treatment of the raw materials, has the advantages of simple operation, mild reaction condition, low production cost, no pollution and easy large-scale production, and solves the problems that a conventional carbon nanotube preparation method has high cost, complex process, and difficult separation with a catalyst and the like; and the obtained multi-walled carbon nanotubes have the advantages of uniform size, uniform pore size distribution, high purity and no catalyst residues.