Industrial production method of nano carbon fiber

The invention relates to an industrial production method of nano carbon fiber. The production method is characterized by comprising steps as follows: a carbon source and a catalyst are mixed uniformly in a certain ratio, then subjected to pressurized vaporization and heated to 200-600 DEG C; carrier gas at the temperature of 200-600 DEG C is mixed; the mixture of the carbon source, the catalyst and the carrier gas is sent into a reaction furnace and passes through a reaction furnace in a plug flow form; the carbon source grows into nano carbon fiber particles under the reaction conditions of -10-20 KPag and 900-1300 DEG C under the action of the catalyst; the catalyst is formed by supporting at least one transition metal organic matter or transition metal alloy organic matter on a carrier, wherein the content of transition metal or transition metal alloys is 0.01wt%-100wt%, and the content of the carrier is 0-99.99wt%; the carrier gas at least contains hydrogen, and the ratio of hydrogen to the carbon source