The invention relates to the technical field of preparation of titanium-based composite materials, and relates to a carbon nanotube coated titanium spherical composite powder and a preparation methodthereof. The composite powder takes titanium or titanium alloy as matrix, and a coating layer comprises carbon nanotubes, and the carbon nanotubes account for 0.1%-5.0% of the total weight of the composite powder. The carbon nanotube coated titanium spherical composite powder and the preparation method thereof are mainly realized by the surface treatment of powder combined with a fluidized bed chemical vapor deposition technology, compared with a traditional mechanical mixing technology, the technology is simple, the production process is short, the cost is low, and large-scale production is easy to realize, and the industrialization prospect is good.