Abstract: Taking SnCl₄·5H₂O, graphene as raw material and adopting the sol-gel method to prepare SnO₂doped graphene film on quartz glass substrates, this paper investigates the effects of film thickness on thestructure and optical properties of SnO₂ thin films. Test results show that the crystalline quality of SnO₂thin films is improved with the incorporation of graphene, and the optical band edge of film sample movestowards long-wave direction, causing "red shift" phenomenon. Moreover, the photoluminescence intensityof the SnO₂ thin films gradually decreased with the increase of the content of graphene due to theconcentration quenching effect.