Currently, much attention is paid to the development of efficient green materials derived from renewable resources characterized by biodegradability and non-toxicity to neither human nor environment. In this study, nano-carbamoylethyl cellulose (NCEC) with D.S. of 0.8 and size of ca 37nm was harnessed for preparation and stabilization of copper nanoparticles (CuNPs). To achieve the goal, NCEC acted as stabilizing agent during the synthesis of CuNPs. Indeed, CuNPs were produced in spherical shape with small sizes in range of 25 nm as signified by UV-vis spectroscopy and TEM. Nevertheless, the colloidal solutions of CuNPs at different concentrations exhibited extremely high stability.