The water treating magnetoelectric dialysis process may be used in sea water desalting, salted water desalting, sea water concentration to produce salt, desalting industrial water, etc. Ion exchange membrane with selective penetration is utilized in establishing a water processing electric dialysis space, where electrolyte ion is made to migrate directionally in the DC electric field. The present invention features that in the electric dialysis space, one static magnetic field is applied, which has magnetic force line direction perpendicular to the water flow direction and the current direction to strengthen the directional migration of anion and cation in the flowing solution. The present invention is superior to available electric dialyser with small water processing amount, great power consumption, easy scaling and other demerits. The present invention is realized simply through applying two permanent magnets onto two opposite walls of the electric dialyser casing.