By using grey theory, the prediction model of dynamic elastic modulus GM(1,1) of recycled concrete under freeze-thaw cycles was established. Based on the existing experimental data and GM(1,1) prediction model, the dynamic elastic modulus of recycled concrete under other freezing-thawing cycles was predicted. Then, according to life adjustment formula proposed by Vesikari^[1], the frost-resistant life of recycled concrete under real natural conditions was predicted. Through calculation and analysis, the results show that the variance ratio of GM(1,1) of the frost resistance model is less than 0.35, and the probability of small error is more than 0.95. With high accuracy, it can be used to predict and analyze the dynamic modulus of elasticity of the frost resistance of recycled concrete. When the content of recycled aggregate is 60%, the frost resistance of recycled concrete reaches the best. For Yichang area, its anti-freezing service life can reach up to 183 years.