A method for coating aluminum trihydride with carbon nanotubes comprises the following steps: 1), forming a complex from the aluminium trihydride and organic amine, and preparing an aluminum trihydride solution through an amine exchange reaction; 2), chopping the carbon nanotubes in a nitric acid solution with a certain concentration; 3), mixing the chopped carbon nanotubes and the aluminum trihydride solution, separating out the aluminum trihydride from the carbon nanotubes under the action of a catalyst, filtering, and drying to obtain the carbon nanotube-coated aluminum trihydride. By the method, the problem that currently, the aluminum trihydride cannot be coated in the nanoscale carbon nanotubes is solved; the aluminum trihydride can be effectively applied to solid propellant fuels, catalysts, hydrogen storage materials, fuel cells and the like; meanwhile, a technical way is provided for preparing the nanoscale aluminum trihydride.