Silicon oxide (SiO_x) is considered to be one of the most promising anodes of lithium-ion batteries for its advantageous capacity and abundant natural resources. However, the practical application of SiO_x is facing great challenges due to its low conductivity and poor cycle performance. In order to accelerate the commercial application of SiO_x, we constructed a pitch pyrolytic carbon rigid coating and a highly conductive polyvinyl alcohol/polyethyleneimine/carbon nanotubes (PVA/PEI/CNTs) flexible coating on the surface of micron-sized SiO_x. The synergistic effect of the double coating enhances the conductivity of SiO_x, reduces the strain stress caused by the volume change of SiO_x, prevents the particles from breaking away from the current collector, and maintains the structural integrity of SiO_x under long-term cycling. The obtained SiO_x/E@CPPC anode exhibits high initial coulombic efficiency (73.91%), excellent cycle stability (645.8 mAh·g⁻¹ after 700 cycles at 0.5 A·g⁻¹) and excellent rate performance (407.1 mAh·g⁻¹ at 5 A·g⁻¹). The double coating makes SiO_x/E@CPPC composites have a good application prospect in lithium-ion batteries.