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In this paper, silver nanoparticles/sulfonated polystyrene (Ag/SPS) composite microspheres were synthesized by using sulfonated polystyrene microspheres (SPS) as carriers and loaded with silver nanoparticles on its surface. The composite microspheres were characterized by scanning electron microscopy, infrared spectroscopy, XRD spectroscopy and thermogravimetry. The results showed that at 70 °C and reaction time of 8 h, the monodispersity of Ag/SPS composite microspheres prepared by chemical reduction method was good and the silver nanoparticles were uniformly coated. The results of catalytic reduction of methylene blue showed that in a certain range, the higher the silver content of the composite microspheres, the faster the catalytic rate. The results of reuse experiments showed that the composite microspheres had high reusability. [ABSTRACT FROM AUTHOR]