Abstract: The sepiolite was taken from Xiangtan, Hunan Province as an adsorbent. The ascorbic acid was adsorbed by the sepiolite in wastewater and the process was investigated experimentally. The results indicated that after 6.0 min the sepiolite has an adsorption efficiency up to 55% if the dose is 15 g/L with a pH value 5.5 and the initial concentration of ascorbic acid is 150 mg/L, while the efficiency becomes 66.3% if the initial concentration of ascorbic acid is 70.0 mg/L. The saturated adsorption is 6.5 mg/g. Adding a bit of polymerized aluminum chloride into the wastewater can improve greatly the adsorption efficiency, which is possibly due to the synergistic reaction of adsorption with flocculation. According to the test results, the particle size of the sepiolite is fine with high specific surface area. So the sepiolite is naturally a harmless adsorbent available to be used for quite thorough wastewater.