In order to study whether the rice husk ash can be used as filler in cold recycled emulsified asphalt mixture, different amounts of rice husk ash and mineral powder were added into the mixture as experimental group and control group. The mechanical properties, low-temperature properties, high-temperature properties, and water stability of the mixture were tested by indirect tensile test, low-temperature splitting test, high-temperature rutting test, and freeze-thaw splitting test, respectively. The microstructure and main elements of rice husk ash were ob? tained by scanning electron microscope and EDX energy spectrum analysis. The results show that rice husk ash has a larger specific surface area, higher porosity, and amorphous silica content. Compared with mineral powder, rice husk ash can improve its high-temperature and mechanical properties when added into the cold regenerated mixture. In or? der to meet the requirements of low-temperature performance and water stability, the percentage of rice husk ash as a filler should not exceed 3% of aggregate and other filler mass sum. The conclusion is that it is feasible to add rice husk ash into cold recycled emulsified asphalt mixture as the road base in arid and non-cold regions.