The invention discloses a method for directly manufacturing a carbon nanotube composite conductive agent. The method comprises the following steps: first, uniformly mixing a catalyst and conductive carbon particles used for preparing the carbon nanotubes; then using the mixture as a catalyst and producing a primary product of containing a carbon nanotube composite conductive agent as well as the catalyst by a chemical gas-phrase precipitation method; at last, removing active ingredients and a carrier of the catalyst from the primary product containing the carbon nanotube composite conductive agent with a diluted acid and/or diluted base, separating, washing and neutralizing the carbon nanotube composite conductive agent and drying the carbon nanotube composite conductive agent by a spray drying method or the prior method of filtering first and then drying to obtain the carbon nanotube composite conductive agent. The method avoids the use of an ultrasonic dispersion device in the preparation of a composite of a carbon nanotube and carbon particles, and is suitable for mass production of carbon nanotube composite conductive agent.