Abstract: This paper reported on the methods to purify the carbonized rice husk (CRH) including acid leaching and ultrasonic field purification. The effect of mass fraction of hydrochloric acid leaching time, temperature, ratio of leaching liquid to solid and strring speed on impurity remove was investigated. The optimal leaching conditions are CRH particle size less than 75 μm, 5% hydrochloric acid, reaction time of 3 h, temperature of 60°C, ratio of leaching liquid to solid at 14:1 and stirring speed of 60 r/min, respectively. Under this optimum condition, 96.41% of the metallic elements and 66.68% of the non-metallic elements can be removed. The effect of ultrasonic field was also investigated and the elimination of metallic and non-metallic impurities can reach up to 99.07% and 71.77%, respectively.