[Objective] A novel multisite Fc₂-MIL-100（Fe）@SBC composite material with adsorption, reduction, and potential catalytic functions was developed, and its synergistic removal performance and mechanism for hexavalent chromium [Cr（Ⅵ）] -chlorpyrifos（CPF） combined contamination were systematically investigated, in order to provide new insights for the design of high-efficiency composite pollution remediation materials. [Methods] Using activated sludge-based biochar（SBC） as a carrier, ferrocene（Fc） was simultaneously compounded with MIL-100（Fe） via an in situ hydrothermal method to prepare the Fc₂-MIL-100（Fe）@SBC composite. The effects of dosage, pH value, and temperature on the removal of Cr（Ⅵ） and CPF were examined, and the mechanisms were analyzed through adsorption kinetics, isotherm models, and pH effect analysis. [Results] Under the optimized conditions（dosage of 30 mg, pH=6, temperature 30 ℃）, the removal rates of Cr（Ⅵ） and CPF by this material both exceeded 95%, reaching adsorption equilibrium within 8 h. The adsorption process was consistent with pseudo-second-order kinetics and the Langmuir isotherm model, indicating monolayer chemisorption domination. The pH effect analysis revealed that the material achieved Cr （Ⅵ） reduction and immobilization and efficient CPF removal through a dual-pathway synergistic effect of adsorption-reduction and adsorption-enrichment. [Conclusion] The Fc₂-MIL-100（Fe） @SBC composite material exhibits efficient synergistic removal capability for Cr（Ⅵ） and CPF under acidic to weakly acidic conditions, demonstrating strong application potential in the remediation of water bodies co-contaminated with heavy metals and pesticides.