Four-point bending tests were conducted to study the flexural toughness of nano-SiO₂ and hybrid fiber reinforced epoxy resin cementitious repair materials （NF-ECRM），and toughness indices I₅，I₁₀ and I₂₀ were selected to evaluate the influence of different contents of PVA-steel hybrid fibers on the flexural toughness of NF-ECRM. The results show that PVA-steel hybrid fibers can effectively improve the flexural toughness of NF-ECRM. When the NF-ECRM specimens are mixed with 1.2% steel fibers，the toughness indices I₅，I₁₀ and I₂₀ first increase and then decrease with the increase in the content of PVA fibers，and reach the peak value as the content of PVA fibers is 0.9%. When the specimens are mixed with 0.9% PVA fibers，the toughness indices I₅，I₁₀ and I₂₀ of the repair materials first increase and then decrease with the increase of steel fibers content，and the overall performance reaches the best when the steel fibers content is 1.2%. The optimal combination of specimens is 0.9% PVA fibers and 1.2% steel fibers. The research findings can be applied to dam repair projects，effectively enhancing the durability and impact resistance of dam structures and extending their service life.