I n the process of drilling and servicing oil wells, KCl and NaCl used to providehydrostatic pressure into the bowels of the earth. Brine solution is producedaccidentally to the surface facility when the oil lifting process is carried out andinduces the thickness of the oil-water emulsion in the separation tank. Emulsionsmust be broken down into oil and water phases so that they do not interact with theoil treatment process in the refinery unit. Emulsion stability is influenced by pH,salinity, temperature and concentration of asphaltene, resin and wax. The purposeof this study was to determine the effect of salinity on the oil-water demulsificationprocess. This research was conducted by varying the salinity of 5%, 15%, 25%, and35% in a 100 ml oil-water emulsion sample with a ratio of 1: 1 oil and water.Demulsification of the emulsion sample using the precipitation method for 120minutes by recording the% of oil volume separate every 20 minutes, at temperaturesof 30 ° C and 110 ° C. The higher the temperature given, the more stable theemulsion in crude oil. From the final result after 120 minutes of pricipitation shownthat emulsion separation process which influenced by NaCl salinity is more difficultthan the effect of KCl salinity.