Abstract: Inorganic polymer flocculants，poly(magnesium silicate zinc sulfate) (PSMZS) were prepared by the copolymerization of sodium silicate with zinc sulfate and magnesium sulfate. The influences of SiO₂ concentration，activation time，Mg/Si and Zn/Si molar ratio and flocculant dosage on the flocculation efficiency were investigated. The structure and morphology of the prepared PSMZ flocculant were studies using XRD and SEM. The optimal preparation conditions for PSMZ are 0.4 mol/L of SiO₂ concentration，1.5 hours of ageing time with 1∶5∶0.5 of Si∶Mg∶Zn molar ratio. The optimal flocculant dosage was found to be 25 mL/L wastewater，where PSMZS has a banded structure featuring excellent flocculation efficiency.