Abstract: Active clay containing magnesium (AC-Mg) was prepared by composite modification with active clay as raw material. As an efficient adsorbent, AC-Mg reacted with low concentration ammonia nitrogen and phosphorus in simulated wastewater. BET, XRD, SEM, FTIR and particle size of the recovered products were analyzed by the modified active clay and reaction. The mechanism of low concentration ammonia nitrogen removal and recovery, the effect of reaction temperature and initial pH of solution on the effect were investigated. The results showed that the removal equilibrium was achieved under the conditions of ammonia nitrogen concentration of 60mg/L, phosphorus source concentration of 60mg/L and temperature of 25℃ for 2.5h. The removal process of ammonia nitrogen conforms to the quasi-second-order kinetic model (R2 > 0.98), and the adsorption of ammonia nitrogen is affected by both surface diffusion and internal diffusion. The adsorption process was in accordance with Langmuir model (R2=0.9983), and the maximum unit removal was 37.05mg/g, of which adsorption removal was 5.56 mg/g and crystallization reaction removal was 31.49mg/g. The optimal pH of this method is 9.0, and the removal rate of ammonia nitrogen is 54.57%.