The wastewater of palygorskite clay acid activation causes serious env ironmental pollution during the production of fuller's activated earth. Such was te water was used by the authors to prepare polymerized aluminum-ferrum chloride (PAFC) through the addition of high concentration of alkali under certain condi tions. The optimal pH in the process of the preparation of PAFC was 4.0, and the product obtained can basically meet the State Water Treatment Agent Standard of GB15892-2003. With the addition amount of 480 mg/L of PAFC, the removal rate of turbidity reached 98.3% for the synthetic water, and the operation could be adapted to a relatively wide pH range, suggesting that the treatment effect is bett er than that of the other commonly-used flocculants.