Nanoscale zerovalent iron supported on biochar made by pineapple peel (nZVI/BC) was synthesized and its Cr (VI) removal capability was evaluated and compared with pure nZVI and raw biochar. The effects of pH and initial Cr (Ⅵ) concentration on the removal of Cr (Ⅵ) were investigated. The removal mechanism was studied. The Cr (Ⅵ) removal efficiency by nZVI/BC achieved 90.3% at pH=3 and the minimum removal efficiency was observed at pH=9. The adsorption kinetics data agreed well with the pseudo-second-order (PSO) model. When the initial concentration of Cr (Ⅵ) increased from 10mg / L to 30mg / L, the rate constant decreased from 0.4660 to 0.2371, indicating that the reaction rate decreased with the initial concentration of Cr (Ⅵ) increasing. SEM images revealed that nanoscale was well attached to the surface of the biochar. XRD and XPS analysis of before and after reaction proved that nZVI and Cr (Ⅵ) underwent adsorption, reduction and coprecipitation during the reaction. Therefore, Nanoscale zerovalent iron supported on biochar made by pineapple peel can be used as an effective composite material for Cr (Ⅵ) removal in water.