This study presents the synthesis of linearly interlinked iron single-atom catalysts (FeSACs) loaded onto interconnected carbon channels for use as cathodic sulfur hosts in room-temperature sodium-sulfur (RT/Na-S) batteries. The FeSACs, characterized by unique metallic iron bonds, facilitate electron transfer to the sulfur cathode, accelerating reaction kinetics. The columnated and interlinked carbon channels ensure rapid Na⁺ diffusion, supporting high-rate battery reactions. The combination of Fe atomic chains and topological carbon channels results in effective high-rate conversion performance and excellent stability. Notably, the Na-S battery retains a capacity of 325 mAh g⁻¹ after 5000 cycles at a current density of 10 A g⁻¹. This work opens new avenues for the design of catalysts and carbon ionic channels, advancing sustainable and high-performance energy devices.This study presents the synthesis of linearly interlinked iron single-atom catalysts (FeSACs) loaded onto interconnected carbon channels for use as cathodic sulfur hosts in room-temperature sodium-sulfur (RT/Na-S) batteries. The FeSACs, characterized by unique metallic iron bonds, facilitate electron transfer to the sulfur cathode, accelerating reaction kinetics. The columnated and interlinked carbon channels ensure rapid Na⁺ diffusion, supporting high-rate battery reactions. The combination of Fe atomic chains and topological carbon channels results in effective high-rate conversion performance and excellent stability. Notably, the Na-S battery retains a capacity of 325 mAh g⁻¹ after 5000 cycles at a current density of 10 A g⁻¹. This work opens new avenues for the design of catalysts and carbon ionic channels, advancing sustainable and high-performance energy devices.