A new POM-based coordination polymer, [Cl₂Cu^I₁₁(trz)₈][H₃SiW₁₂O₄₀] (1), was successfully obtained under hydrothermal reaction. The compound was characterized by single-crystal X-ray diffraction, TG analyses, IR spectra and PXRD analysis. Compound 1 shows extreme stability and outstanding catalytic activity to the degradation of organic dye pollutant.