Method for efficiently dispersing carbon nanotube

A method for efficiently dispersing carbon nanotubes, characterized in that:

• the method comprises mixing, in parts by mass, 1-30 parts of original carbon nanotubes without side wall functionalization or end group functionalization, 0.2-10 parts of functionalized carbon nanotubes and 400-1200 parts of a solvent, adjusting a pH of a resulting mixture to 5-9, and then ultrasonically dispersing the mixture to obtain a stably dispersed carbon nanotube dispersion;
• the functionalized carbon nanotube is one or more of a carboxylated carbon nanotube, a hydroxylated carbon nanotube, an aminated carbon nanotube, an acyl-chlorinated carbon nanotube, and a sulfonated carbon nanotube.