A liquid-bath-assisted salt-template combustion activation method has been developed to overcome the shortcomings of the conventional template method, including elaborate processes and environmental pollution. Herein, N/S double-doped porous carbon material (ECSK-15) with high specific surface area (1148.60 m2 g-1) is synthesized through it for sodium-ion batteries (SIBs). Benefitting from this approach, the number of ion diffusion channels and the ion exchange rate of the product are significantly increased. When using ether-based electrolyte, after 1000 cycles at a large current density of 2 A g−1, the reversible capacity could still be maintained at 135.60 mA h g−1. The assembled full cell exhibits a high reversible capacity of 480.49 mAh g-1 at a current rate of 0.5 A g-1. The energy density is calculated to be 204.11 Wh kg-1 at a power density of 160.71 W kg-1. This work provides a porous carbon anode material with good sodium-ion storage capacity and multiplicity performance for application in SIBs, as well as a new pathway for the green synthetic utilization of the molten salt template method in the field of energy storage.