Carbon nanotube continuous preparation device and preparation method

The invention discloses a carbon nanotube continuous preparation device which comprises a carbon dioxide conversion unit connected with a carbon dioxide pretreatment unit, an exhaust port of a pyrolyzing furnace is connected with a desulfurization device, a filtering device and a hydrogen separation device, and a slag discharge port of the pyrolyzing furnace is connected with the carbon dioxide conversion unit. The hydrogen separation device is connected with the carbon dioxide conversion unit. A feeding device connected with a feeding hole of the fluidized bed reactor is connected with the hydrogen separation device; a gas inlet of the fluidized bed reactor is connected with a gas outlet of the carbon dioxide conversion unit, and an induced draft fan is arranged on the fluidized bed reactor; the fluidized bed reactor is provided with a discharge port for discharging the carbon nanotubes; and a gas outlet of the fluidized bed reactor is connected with the carbon dioxide conversion unit. The invention further