Hard carbon is considered an exemplary anode material for sodium ion batteries (SIBs) due to its lower voltage platform and higher layer spacing. However, the sodium storage performance of hard carbon is suboptimal, and its initial Coulombic efficiency (ICE) is low, thus posing significant challenges to its practical application. Here, silicon-doped porous hard carbon is successfully synthesized as an anode material for SIBs through recycling low-cost Wuliangye distillers' grains as the precursor. The substitution of silicon atoms for carbon atoms in the carbon framework leads to an increased interlayer spacing, thereby enhancing the reversible specific capacity and ICE. Additionally, the linear control of the roasting temperature results in the production of hard carbon with a high specific surface area (525.23 m