The invention discloses a fabrication method of an automobile brake disc. An automobile brake pair pre-fabricated body is fabricated with carbon fiber prepreg through integrated molding pressing, anda polysilazane solution and a polycarbosilane solution are used as a ceramic precursor; the automobile brake pair pre-fabricated body is fabricated through an integrated molding pressing process, andthe density of the pre-fabricated body is larger than 1.4 g/cm3; a carbon fiber automobile brake pair pre-fabricated part is impregnated through the liquid ceramic precursor; the liquid precursor is subjected to high-temperature pyrolyzing after cross-linking and solidifying are finished and then is converted into a ceramic substrate; and then the impregnation-pyrolysis process is repeated, and finally a carbon fiber reinforced carbon-based/ceramic-based composite material is obtained. The production period is shortened greatly, the production cost is reduced, the densification efficiency is improved, and through adjustment of the impregnation proportion of polycarbosilane and polysilazane, the friction property and mechanical strength of an automobile brake pair can be optimized at the same time.