The key to asphalt recycling lies in the appropriate selection of the recycling agent. To improve the recycling value of recycled asphalt pavement (RAP) fine materials, based on fine separated RAP fines and combined with viscosity recovering rejuvenator for recycled micro overlay mixture design, the performance of recycled asphalt binder and mixture was studied, and the influence of different rejuvenator types and RAP content was analyzed. The results show that: considering the recoverable degree of aggregate gradation and recycled asphalt performance requirements, the maximum content of fine separated RAP fines in SMA-5 recycled micro overlay is determined to be 30%; compared with ordinary recycled asphalt, the softening point, 5 ℃ elongation and 60 ℃ kinematic viscosity of recycled asphalt using viscosity recovering rejuvenator are higher, and the pull-out strength is close to that of high-viscosity asphalt; with the increase in content of fine separated RAP fines, the high temperature performance of the recycled micro overlay mixture is improved, while the low temperature crack resistance, water damage resistance and raveling resistance performance are reduced. With 30% RAP content, compared with ordinary recycled mixture, the recycled mixture using the viscosity recovering rejuvenator is 45.2% higher in low temperature crack resistance, 1.7% higher in water damage resistance, and 23.2% higher in raveling resistance; according to the engineering application, the recycled micro overlay using fine separated RAP has a good effect.