Nanostructure is attractive and has been proved superior in numerous applications due to the unique physical and chemical properties of the nano-materials. However, facile preparation of the nanostructured materials remains challenging; much effort is still essential to obtain materials with designed morphology. As a semiconductor, SnO2 has been found a variety of applications such as solar cells and sensors, and has been extensively investigated as an anode material for lithium (Li)-ion batteries. Herein, we present a one-step and eco-friendly method to synthesize SnO2 nanorods without any templates or additives. On the basis of its structural and morphologic evolutions probed by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM), SnO2 nanoparticles are proposed to firstly form from its precursor Na2SnO2 ·3H2O and then assembled to nanorods with increased hydrothermal reaction time. When used as an active material for sodium (Na)-ion batteries, the as-prepared SnO2 nanorods show a high Na-storage capacity and initial coulombic efficiency as well as good cycling stability. Our findings shed light on the preparation of nanostructured materials and contribute to developing highperformance Na-ion batteries.