According to the the characteristics of high salinity oilfield sewage collection system corrosion, using rosin and oleic acid, hydroxyethylethylene diamine and sodium chloroacetate, through amidation, cyclization and quaternization reactions, adding sodium ethylenediamine tetramethylenephosphonate, developed a corrosion inhibitor SDH-1 for high salinity. The structural characterization of the corrosion inhibitor SDH-1 was characterized by IR and GC-MS, the corrosion inhibition performance of it for 20# steel was evaluated, and it’s scale inhibition performance and demulsification performance were investigated; the inhibition mechanism was analyzed by isothermal adsorption behavior and polarization curve measurement. The results show that when the inhibitor concentration of SDH-1 was 30 mg/L, the corrosion inhibition efficiency was 90.47% in the formation water system with salinity of 243063 mg/L, the antiscale rate was 85.96%, the water diversion rate was 96.3%; the adsorption of corrosion inhibitor on the metal surface is in accordance with Langmuir adsorption isotherm, which is a kind of compound corrosion inhibitor mainly for suppressing anode corrosion . Compared with the commercially available corrosion inhibitors, the corrosion inhibition efficiency of corrosion inhibitor SDH-1 was increased by more than 12%, which could effectively reduce the corrosion rate of pipeline steel under high salinity.