A polymer carbonization route was designed to synthesis carbon network-supported Fe3O4@C composites. The Fe3O4 nanoparticles with an average of ∼200nm were uniformly wrapped up in this novel carbon network. As an anode material for rechargeable lithium-ion batteries, the Fe3O4@C composites present attractive properties with a high specific capacity of 730mAhg−1 at 2C after 300 cycles. The novel carbon network plays a key role in enhancing the electrochemical performance of the composites.