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In this data article, we provide field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDS) images of wet-spun polyurethane (PU)-silver nanoparticles (AgNPs)/graphene nanoplatelets (GNPs) composite fibers according to the content of AgNPs and GNPs. In addition, microstructural changes of PU-AgNPs/GNPs composite fibers due to heat treatment at various temperatures are provided. The data collected in this article is directly related to our research article “Stretchable and Electrically Conductive Polyurethane- Silver/Graphene composite fibers prepared by wet-spinning process” [1]. Keywords: Composite fiber, Microstructure and chemical analysis, Field emission scanning electron microscopy, Energy dispersive X-ray spectroscopy, Wet-spun, Silver nanoparticles, Graphene nanoplatelets