The present disclosure provides a natural adsorbent, which is composed of a zeolite and a bentonite. Based on a total weight of the natural adsorbent is 100 weight percent, a content of the zeolite is 20 to 60 weight percent, and a content of the bentonite is 40 to 80 weight percent. Therefore, the natural adsorbent of the present disclosure obtained by mixing the zeolite and the bentonite can adsorb cobalt ion nuclei and cesium ion nuclei at the same time, so as to enlarge the adsorption effect. |