<p>Due to the material properties of silicon oxide powder and the limitations of the layer-by-layer 3D printing method, the strength of the finished ceramics is relatively low. Therefore, it is necessary to find a suitable method to improve the mechanical properties of 3D printed silica ceramic components. Impregnation is a very attractive method. It introduces new phases into the pores of ceramics through sol impregnation, thereby improving the mechanical properties of ceramic parts. The different sols (ZrO₂, TiO₂, B₂O₃, Y₂O₃, Al₂O₃, and SiO₂) impregnated 3D printed silica ceramics; the different sols’ effect on the properties of the samples was investigated in this work. Research shows that under vacuum conditions, sol molecules are more likely to penetrate into the interior of the ceramic matrix. Due to its good solubility, Y₂O₃ sol is more likely to penetrate into the interior of the ceramic matrix under the same conditions, thus providing the highest strength enhancement for ceramic samples, increasing from 8.39 ± 0.84 to 10.78 ± 1.67&#xa0;MPa. Sintering after impregnation does not significantly affect the shrinkage rate of ceramic components, which has important guiding significance for the secondary strengthening of already formed ceramic components.</p>