Silicified graphite was prepared by liquid-phase siliconizing method and in-situ reaction method. The influence of graphite matrix density and siliconizing method on the mechanical properties and friction properties of siliconized graphite was discussed. The results show that the two methods can significantly improve the flexural strength of graphite. The surface of the siliconized graphite prepared by the liquid-phase siliconizing method has a SiC layer with a concentration gradient, which can significantly improve the wear resistance of the matrix. Considering the comprehensive mechanical properties and friction properties, choosing low-density graphite through graphitization treatment and adopting the liquid phase siliconizing method can prepare silicified graphite with better performance.