In order to study the improvement effect of nano tougheners on CFRP sheets and the impregnated resin, the impregnated resin and CFRP sheets with different nano tougheners were prepared, and the viscosity and mechanical properties of the impregnated resin and the tensile strength of CFRP sheets were tested. The results showed that with the incorporation of nano tougheners, the viscosity of the impregnated resin increased and the mechanical properties of the CFRP sheet and the impregnated resin were significantly improved. The improvement effect was related to the type and amount of nano tougheners. The CFRP sheet containing 0.4% nano-SiO₂ toughener showed the best tensile properties.