It is helpful to investigate the non-uniform distribution of chloride after electrochemical chloride extraction by ascertaining the distribution characteristics of electric field during electrochemical chloride extraction. In order to study the effect of electric field on the migration of chloride ions, a shielded buried electrode array was used to ascertain the distribution characteristics of chloride and electric field around reinforcement nets. The results show that the electric field in concrete affects the migration of chloride ions, when a region with strong electric field, chloride ion migration rate is high, residual chloride ion concentration is low, when a region with week electric field, chloride ion migration rate is low residual chloride ion concentration is high.