Adsorption batch models for removal heavy metal ions and increase the pH from acid mine drainage synthetic by bentonite and bentonite-Fe3O4 composite were studied. The composite was prepared with mass ratio of bentonite and Fe3O4 of 2:1 and 1:1. The characterized of adsorbents by FTIR, SAA and VSM. Acid Mine Drainage (AMD) synthetic for simulation has low pH and some heavy metal ions. The effect of weight of adsorbent and contact time were investigated. The results showed that bentonite, bentonite-Fe3O4 (2:1) and bentonite-Fe3O4 (1:1) composites havedifferent capacities toremoval heavy metal ions and increase the pH. The bentonite-Fe3O4 composite in mass ratio (2:1) of the most potentially to treatment acid mine drainage. Concentrations of heavy metal ions like Fe2+, Cu2+, Zn2+ and Mn2+in the acid mine drainage synthetic can reduced from 15.89 to 94.45 % and pH increased from 2.97 to 7.62.