Recycled aggregate concrete （RAC） was modified by adding nano-SiO₂ （nano-silica sol and nano-SiO₂ powder）and nano-CaCO₃ powder to study the fracture performance. The fracture property of RAC modified by nano-materials was tested by three-point bending beam method and traditional electrical measurement. The results show that the 28 d compressive strength and splitting tensile strength of RAC can be effectively improved by adding proper amount of nano-SiO₂ and nano-CaCO₃. Adding 1.0% nano-silica sol，0.5% nano-SiO₂ powder and 2.0% nano-CaCO₃ powder respectively has the most effective on the improvement of double-K fracture parameters and fracture energy. After the addition of nanomaterials， more cracks pass through the recycled aggregate than that for ordinary concrete； nanomaterials promote production of higher density hydrate and reduction of the number of internal pore in interface transition zone.