Charging connector of electric vehicles faces two working conditions of sliding friction and current-carrying fretting. Traditional Ag coating is difficult to meet the performance requirements. Herein, Ag/graphene composite coatings were prepared by electroplating, and the chemical compositions, crystal phase, mechanical and tribological properties were studied. The results showed that adding graphene increased the hardness, elastic modulus and toughness. Under sliding friction and current-carrying fretting, Ag/graphene coating exhibited low COF and wear, stable and low ECR. The sliding friction mechanism was dominated by abrasive wear, while the current-carrying fretting mechanism was dominated by adhesive and fatigue wear. The worn surface analysis indicated that the superior tribological properties were attributed to the improved mechanical properties and the formation of transfer film.