Abstract: In this study, different proportions of silicon polymer-graphene oxide (PSOL-GO) were used as nano-fillers to modify glass fiber/epoxy resin (GF/EP) composites, the composites with different PSOL-GO contents were prepared. The microstructure and strengthening mechanism of epoxy composites were analyzed by observing morphology, measuring contact angle, infrared analysis, mechanical properties and dynamic mechanical analysis (DMA). The experimental results show that the mechanical properties of PSOL-GO@GF/EP composites are the best when the mass ratio of PSOL-GO is 1∶0.1: The interlayer shear strength of modified GF/EP composites is 13.19% higher than that of pure GF/EP composites; Its bending strength increased by 33.12%; Its tensile strength increased by 35.32%; Its impact strength increased by 16.95%. The glass transition temperature (T_g) of GF/EP composites was increased by 7.1℃ by adding PSOL-GO at 1∶0.1 mass ratio, and the heat resistance of GF/EP composites was improved. The epoxy resin with the introduction of PSOL-GO nano-filler has better wettability to glass fibers, and can fill the gap of pure GF/EP composite itself to enhance the performance of the composite materials.