An experimental method of electrochemical realkalization for carbonated concrete was designed and two reasonable evaluation indexes for its effectiveness, pH value and migration content of sodium ion, were proposed. Further, effects of types and concentration of electrolyte solution, realkalization time on the effectiveness of electrochemical realkalization for carbonated concrete were investigated. The results show that the pH value increases but increase rate of pH value slows down with the increase of realkalization time. For the same electrolyte solution, the higher the electrolyte solution concentration, the higher the migration content of sodium ion in carbonated concrete after realkalization is. For the same concentration of different types of electrolyte solution, the migration contents of sodium ion in carbonated concrete after realkalization are different.