The invention discloses a multilayer composite diamond-like film material and a preparation method thereof. The multilayer composite diamond-like film is prepared by alternatively depositing Ti-dopedhydrogen-containing non-crystal carbon and non-doped hydrogen-containing non-crystal carbon periodically according to a certain proportion. The prepared Ti-DLC/alpha-C:H film has high bonding strength, high toughness and superior antifriction performance and wear resistance, can prolong the service life of a cutting tool by two times when coating the cutting tool for processing a glass fiber reinforced composite material, and can prolong the service life of the tool by 48 percent compared with the conventional single-layer diamond-like coating tool. The multilayer composite diamond-like film material has the advantages of advanced preparation process, high production efficiency, low cost, easiness in industrial production and popularization value.