Abstract: The apparatus for mass production of carbon nanotubes uses a high-frequency furnace and a fluid flow process. A metallic catalyst and a reaction gas are supplied into a reaction chamber so that the catalyst and the decomposed carbonization gas are reacted in a vapor phase in the chamber to produce the nanotubes. After the reaction, the carbonization gas and the carbon nanotubes are transferred to a filter via a heat exchanger in which they are separated from each other. Then, the carbon nanotubes are collected in a collector, hydrocarbon of the reacted gas burns in air and is discharged to the outside, and inert gas, such as nitrogen and argon, is collected and supplied again to the chamber. The apparatus produces the nanotubes in mass quantities under atmospheric pressure, and requires no separate vacuum device, minimizing the scale and cost of the equipment.