The present study was carried out by the formation of silver oxide nanoparticles (Ag2O NPs) using a plant extract from the seeds of Coriandrum sativum for the biosynthesis of Ag2O NPs from silver nitrate solution. Data was characterized using furrier transform infrared radiation FTIR, X-ray diffraction XRD, atomic force microscopy (AFM), and scanning electron microscopy (SEM). Results indicated a successful creation of nanoparticles of Ag2O. FTIR spectra showed a band around (501.49 cm-1), corresponding to the double bond of oxygen of Ag2O and XRD pattern identified the appearance of Ag2O nanoparticles, where six strong peaks were observed at 2θ (32,38, 46, 56,65and 75°) related to Ag2O compared with the reference [11], and that indicated to the formation of these particles. Images of AFM showed Ag2O NPs with an average diameter of (57.31 nm) and SEM indicated a distribution of cubic shape of Ag2O NPs. In addition, the order of reaction was pseudo-first-order. The value of activation energy, enthalpy, the change in entropy and Gipps free energy has calculated. The value of activation energy was (+1.37j\ mol), the value of enthalpy (-1.371 j\mol), the negative value of enthalpy was heat emission. The value of entropy was (+56.53 j\mol) and the value of Gipps free energy was (-3.957 J\mol). In this study, silver oxide nanoparticles were prepared by the bio-synthesis method. The diameter of this particles was (57.31) nm. The kinetics and thermodynamic of this reaction were studied and proved by a chemical equation.