Alumina ceramic membranes have been prepared by electrophoresis using an industrial ceramic as the electrophoretic matrix and alumina sol as the electrophoretic liquid. A nanofiltration membrane was prepared using the electrophoretic process and a coating-drying-sintering process repeated three times. The optimum electrophoresis time was found to be 3min with a voltage of 30 V. The Al₂O₃ ceramic membrane obtained under these experimental conditions was characterized by SEM and liquid-liquid displacement methods. A ceramic membrane with a thickness of 50 μm had a porosity ratio of 31.51%, a pore size of 3.1 nm and a pore size distribution of 2.88 nm to 5.76 nm. Performance tests showed that the membrane had strong interception effects on both inorganic pollutants and organic pollutants.