Self-supporting carbon nanotube films (CNFs) with light absorption in broadband frequency field are prepared by the method of vacuum filtration, and the films can be applied to a variety of environments, such as metal and plastic. Carbon nanotubes aqueous solutions with stable dispersion are prepared with the assist of surfactant. CNFs with different thicknesses are prepared on mixed cellulose membrane filter by vacuum filtration method. Perfect separation of the films is achieved with xenon lamp heating method. The results show that entangled and continuous isotropy CNFs with staggered planar mesh structure are formed from carbon nanotube dispersion solution and the film thickness is proportional to the amount of deposition carbon nanotubes; the light absorption rate increases with the increase of sheet resistance, which is consistent with optical absorption characteristics in electromagnetic field theory. The light absorption rate in the wavelength region of 350~2500 nm is 94%~98%, which has certain potential.