KCl supported on activated green mussel shell (KCl/ AGMS) was prepared by impregnation method and characterized with FTIR, XRD, SEM and EDS instruments. The prepared material shows an incredible catalytic ability in Knoevenagel condensation producing good yield of the products 3a-3d. The findings disclose a novel route for the synthesis of Knoevenagel products using cost-effective and green catalyst.