The invention belongs to the field of composites, and discloses a method for preparing a C/C-SiC composite part and a product prepared through the method. The method comprises the following steps that firstly, carbon fiber/phenolic resin composite powder is prepared by using a solvent evaporation method; secondly, according to a three-dimensional model of the part, the carbon fiber composite powder is molded into an initial molded blank by means of the 3D printing technology; thirdly, the initial molded blank is subjected primary densification and a C/C porous body is obtained; fourthly, the C/C porous body is subjected to a molten silicon infiltration reaction, high-temperature desilication and secondary densificaiton, and the final C/C-SiC part is obtained. By means of the method, the C/C-SiC composite part with a complex structure can be shaped in a near-net mode, the method is short in production period and low in cost, and the C/C-SiC composite part obtained through the method is low in residual silicon content and has excellent performance.