 The amorphous CoMoS4/N-rGO nanocomposites can be synthesized by a simple one-step hydrothermal method as anode materials for sodium-ion batteries (SIBs). Since amorphous structure can provide more ion diffusion transport channels, nitrogen-doped reduced graphene oxide (N-rGO) has high electrical conductivity and also behaves as a buffer to adapt to the volume change of CoMoS4. CoMoS4/N-rGO exhibits enhanced electrochemical performance compared with single CoMoS4. After 100 cycles, CoMoS4/N-rGO has a discharge specific capacity of 414.9 mAh g−1 at a current density of 0.1 A g−1, which is 85% of the initial capacity. In addition, CoMoS4/N-rGO exhibits good rate performance with a specific capacity of 305.5 mAh g−1 at 2 A g−1. CoMoS4/N-rGO nanocomposites will be promising anode materials for SIBs due to their excellent electrochemical properties.