Ex-situ soil washing technology takes the advantage with remediation speed, efficiency, application range etc., and then it has formed relatively perfect legal and method system in the United States and some countries of Europe. Using sulfonated graphene as the eluent, the different eluting parameters were evaluated for the ectopic leaching remediation effect of Cd contaminated soil. It was found that the optimum eluent parameters were 4000 mg/L of eluent concentration, 10︰1 of liquid-soil ratio, four times for continuous washing, respectively, under which the removal rate of Cd could reach up to 50%. With the elution of different contaminated soils, it showed that the removal rate of Cd was related to the proportion of soil clay, Fe or Al and the contents of their free state, the availability of Cd, etc. With 24.7% of Cd removal rate for washing once, sulfonated graphene was better than those of current common eluents (FeCl₃ and CaCl₂) under the same conditions. Therefore, sulfonated graphene plays a certain role on the washing remediation of Cd contaminated soil.