Epoxy composite coatings reinforced with different contents of reduced graphene oxide (RGO) nanosheets were prepared on N80 substrate. The aim of this work is to identify the applicability of RGO modified epoxy coatings on N80 tubing in oil and gas production environments with high temperature and high salinity. Transmission electron microscopy, selected area electron diffraction and scanning electron microscopy were employed to characterize the RGO and coatings. The adhesion, toughness and corrosion resistance of epoxy composite coatings were investigated. It indicated that the proper addition of RGO nanosheets effectively reduced the number and size of pores in the epoxy composite coatings, and improved the adhesion, toughness, corrosion resistance of the epoxy composite coatings. The epoxy composite coating with 1.0 wt% RGO displayed the best anti-corrosion performance in 10.0 wt% NaCl solution.