In response to the limitations of conventional chemical synthesis methods for the structural modulation of nanomaterials, an innovative high magnetic field-assisted wet chemical synthesis method was proposed to prepare NiFe₂O₄/Fe₂O₃ heterostructures. It is found that the high-energy physical field could induce a more homogeneous morphology of NiFe₂O₄/Fe₂O₃, accompanied by phase transformation from Fe₂O₃ to NiFe₂O₄. As a result, the optimized structure obtained under the magnetic field endows NiFe₂O₄/Fe₂O₃ with enhanced performance for the lithium-ion battery anode, as evidenced by an increase of 16% (1200 mA·h/g) in discharge capacity and 24% in ultra-stable cycling performance (capacity retention of 97.1%). These results highlight the feasibility of high magnetic fields in modulating material structure and enhancing lithium storage performance.