Abstract: A polypyrrole/chitosan (PPy/CS) composite membrane was prepared using PPy and CS as raw materials, and the structure of the PPy/CS composite membrane was characterized by infrared, pore diameter analysis, thermal analysis and SEM. The effects of PPy/CS composite membrane on the adsorption performance and adsorption mechanism for Cu(Ⅱ) and Cr(Ⅵ) were discussed. The effects of pH value, adsorption time, and initial concentration of the solution on the adsorption efficiency were investigated. The results show that the adsorption efficiency of PPy/CS composite membrane for Cu(Ⅱ) and Cr(Ⅵ) are greater affected by the initial concentration of the solution. When pH=3.5, temperature is 333 K, the adsorption is shaken at 100 r·min⁻¹ for 50 min, 20 mg of PPy/CS composite membrane adsorbs 6 mg·L⁻¹ of Cu(Ⅱ) and Cr(Ⅵ), PPy/CS composite membrane for Cu(Ⅱ) shows good selectivity and adsorption amount reaches 2.715 mg·g⁻¹; Compared with PPy/CS composite membrane and CS membrane, the adsorption rate of PPy/CS composite membrane for Cu(Ⅱ) increases to 94.14%; The PPy/CS composite membrane adsorbing Cu(Ⅱ) and Cr(Ⅵ) is desorbed and regenerated with 0.1 mol·L⁻¹ NaOH solution. After circulation for 15 times, its adsorption amount changes very small, it can be used multiple times. The adsorption of Cu(Ⅱ) and Cr(Ⅵ) by PPy/CS composite membrane conforms to the pseudo-second-order kinetic model and Langmuir adsorption isotherm.