A method for making carbon nanotube slurry is presented. At least one carbon nanotube film is provided, the at least one carbon nanotube film includes a plurality of carbon nanotubes oriented along substantially the same direction. A substrate is provided, and the at least one carbon nanotube film is attached to a surface of the substrate. The at least one carbon nanotube film is cut perpendicular the oriented direction of the carbon nanotubes with a laser to form a carbon nanotube belt. An inorganic binder and an organic carrier is provided, the carbon nanotube belt, the inorganic binder, and the organic carrier are mixed in an organic solvent to form a mixture. The organic solvent is removed.