The invention discloses a simple method for directly growing a super-hydrophobic carbon nano-tube layer on the surfaces of silica aerogel particles, relates to a method for growing a carbon nano-tubelayer on a surface, and aims to solve the problem that hydrophobic silica aerogel particles which are prepared by the existing method cannot be used in high-temperature and harsh environment. The method comprises the following steps: firstly, preparing the silica aerogel particles; secondly, preparing a ceramic boat which is covered with the silica aerogel particles; thirdly, exhausting air from atube furnace; fourthly, performing chemical vapour deposition; fifthly, naturally cooling to obtain the silica aerogel particles with the super-hydrophobic carbon nano-tube layer which is directly grown on the surfaces. According to the simple method, the silica aerogel particles with the super-hydrophobic carbon nano-tube layer which is directly grown on the surfaces can be obtained.