Carbon nanotube film and preparation method and device thereof

The invention discloses a carbon nanotube film and a preparation method and device thereof, and the specific method comprises the following steps: a spinning solution is pressed into a micron-sized pipeline with the inner diameter gradually reduced along the flowing direction of the solution, and the spinning solution contains magnetic metal filled carbon nanotubes; orienting the carbon nanotubes in the spinning solution in the micron-sized pipeline through an induced magnetic field; and spraying the oriented spinning solution to the surface of a collecting device for attachment to obtain the carbon nanotube film. According to the method, the magnetic metal filled carbon nanotubes in the spinning solution are oriented by utilizing an induced magnetic field, meanwhile, due to the existence of the flow velocity difference and the gradient inner diameter in the micron-sized pipeline, the carbon nanotubes are gradually folded along the center in the radial direction, and the orientation degree of the carbon nanot