PEG doped Ag/TiO2 thin film was prepared by the sol-gel method through the hydrolysis of titanium tetraisopropoxide and silver nitrate solution. Various amount of PEG (0.05g – 0.20g) were added into the solution preparation to study the effect of PEG doped on the optical properties of the prepared thin films. Spin coating method was used to get uniform film on ITO glass substrate followed by annealing process for 1 hour. The obtained thin films were analysed using XRD, SEM and UV-Vis spectrophotometer. Anatase phase of TiO2 thin film were obtained for all prepared thin films. The addition of 0.15g of PEG shows a thin film with a series of a small, coarse and loose crystalline structures compared to the non-PEG thin film structure with a larger and compact structure. The increasing of PEG amount added led to the increasing of light absorption and decreasing of the band gap.