With the utilization of a representative volume element, we investigate the effect of interfacial adhesion on the in-plane viscoelasticity of graphene oxide thin films. A multiple-bond contact model is employed for the interfacial adhesion due to the dynamic association and dissociation of molecular bonds. With an explicit finite element method, we simulate stress–strain curves upon uniaxial loading. Our results reveal that the reversible interfacial adhesion leads to the viscoelasticity of thin films. We further find that the thickness of layers within thin films and also other parameters can have a strong effect on the viscoelasticity of thin films. Local buckling/wrinkling of layers similar to that within engineered graphene oxide thin films is also observed in some simulations. This work might provide important insights into the fabrication of graphene oxide thin films with desirable mechanical performance.