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Antimony (Sb) nanoparticles (SbNP) encapsulated in multiwalled carbon nanotubes (MWCNTs) matrix has been fabricated by a facile two-step ball milling strategy,including a sand milling process to prepare Sb nanoparticles and following high-energy ball milling to synthesize SbNP-MWCNT composite.As an anode material for sodium-ion batteries (SIBs),the SbNP-MWCNT composite with high Sb content (80％) can deliver a reversible capacity of 471.1 mA h g-1 at 50 mA g-1 with an initial coulombic efficiency of 73.5％,excellent cycling stability (94.1％ capacity retention at 800 mA g-1) and high rate capability (210.7 mA h g-1 at 3200 mA g-1).The excellent electrochemical performance of the SbNP-MWCNT composite results from the synergistic effect of downsizing Sb particles and combining MWCNTs.