The invention discloses a crude oil water content data analysis method based on a clustering algorithm. According to a known differential pressure-electric value rule of fluid produced by an oil well,differential pressure-electric value feature points of different oil wells are used as clustering data points, the clustering algorithm is selected to divide the data points into three types including a liquid phase, a gas phase and a mixed phase. The differential pressure-electric value rule of liquid phase fluid is that the differential pressure is high and the electric value is low, the differential pressure-electric value rule of gas phase fluid is that the differential pressure is low and the electric value is high, and mixed phase fluid is in the middle. According to the method, the data point distribution rule of the oil well output fluid under the three fluid characteristics of the liquid phase, the gas phase and the mixed phase is established and analyzed through the clustering algorithm, and the problem that a good clustering result cannot be obtained through traditional data analysis is effectively solved.