Abstract: A novel adsorbent, ferric(Ⅲ) immobilized collagen fiber, was prepared, and its adsorption behavior to bacteria was studied. Ferric was uniformly dispersed in collagen fiber mainly through chemical connection and could withstand the extraction of water. It was found that the ferric(Ⅲ) immobilized collagen fiber exhibited high adsorption capacity to bacteria. The adsorption capacity to E. coli and S. aureus were 2.04×10⁹cfu•g^-1 and 3.15×10⁹ cfu•g^-1 at 30℃ when the adsorption experiments were carried out for 1 h and their initial concentration were 1.02×10⁷ cfu•ml^-1 and 9.8×10⁶ cfu•ml^-1 respectively. The adsorption isotherms could be described by the Freundlich equation. The adsorption capacity was influenced by culture age of the bacteria, but no considerable change was observed at varying temperature and pH. Further analysis indicated that the adsorption kinetics data could be well fitted by the pseudo-second-order rate model, and adsorption capacities calculated by the model were consistent with the actual measurements with error≤2%. In addition, the quite fast adsorption rate of bacteria on ferric(Ⅲ) immobilized collagen fiber was probably due to the fact that the adsorption process took place at the surface of adsorbent.