The paper studied the effect of different recycled coarse aggregate replacement ratio on the frost resistance of recycled concrete.It took the recycled concrete with 100% recycled coarse aggregate concrete as basic concrete to respectively research the effect of steel slag powder and silica fume on the frost resistance of recycled concrete from the respects of appearance features, mass loss rate, the relative dynamic elastic modulus and compressive strength.The results show that with the increase of steel slag content, the frost resistance of recycled concrete decreases; The silica fume can obviously improve the frost resistance of recycled concrete, and the reasonable content of silica fume is 5%;the different ratios of silica fume and steel slag have different influences on the frost resistance of recycled concrete.When the silica fume content is 5% and the steel slag content is 15% in recycled concrete, the frost resistance of recycled concrete is higher than that of basic concrete.