Abstract: In view of the complexity and poor repeatability of the electric quantity method in salt analysis, this paper develops a single wavelength fluorescence spectrometry to analyze the salt content in crude oil, and uses a single wavelength dispersive X-ray fluorescence spectrometer to detect the inorganic chlorine in crude oil. The standard curve method is used to quantify the inorganic chlorine, and then the salt content in crude oil is calculated (measured as NaCl). The recovery rate is between 94.28%-99.51%. The relative standard deviation of six repeated measurements was less than 8%. The quantitative data was relatively accurate and reliable, less than the repeatability of the electric quantity method, and could meet the needs of production.