In this work，magnetic silica nanowires（SiO₂NW@Fe₃O₄）were prepared based on silica nanowires（SiO₂NW）obtained by inverse microemulsion method and in situ chemical oxidation co-precipitation method was used to grow triiron tetraoxide on the surface of silica nanowires. The structures and morphologies of SiO₂NW and SiO₂NW@Fe₃O₄ were studied by X-ray diffraction，Fourier transform infrared spectroscopy，X-ray photoelectron spectroscopy，scanning electron microscopy and transmission electron microscopy. The SiO₂NW@Fe₃O₄ was uniformly dispersed in the epoxy resin by mechanical stirring and ultrasonic dispersion. The epoxy resin was cured in a micro magnetic field to align the magnetic nanowires in specific directions，thus improving the mechanical properties of the epoxy resin in specific directions.Compared with pure epoxy resin，after adding magnetic silica nanowires and curing in a micro magnetic field environment，the tensile strength、impact strength and fracture toughness of the epoxy resin increased by 59. 1%、98. 5% and 135. 0% respectively.