The invention relates to the field of material welding, in particular to a novel low-temperature surface-carburizing assisted brazing method for a ceramic matrix composite. The problem that existing ceramic matrix composite surface brazing filler metal is difficult to wet to cause poor mechanical property of a brazed joint is solved. The method includes: removing surface impurities of the ceramic matrix composite, then putting the ceramic matrix composite into a vacuum device for plasma enhanced chemical vapor deposition, feeding argon, regulating temperature and pressure, then feeding methane gas for performing deposition to obtain the ceramic matrix composite with a carburized layer formed on the surface after deposition is finished, putting ti-based brazing filler metal between the ceramic matrix composite with the carburized layer formed on the surface and a metal material, placing the ti-based brazing filler metal, the ceramic matrix composite and the material into a vacuum brazing furnace, vacuumizing and performing heat preservation at high temperature, and cooling so as to complete the novel low-temperature surface-carburizing assisted brazing process of the ceramic matrix composite.