In this study, the electrolytic treatment by one-stage electrolysis was investigated for electroplating wastewater containing $Cr^{6+}$ and $CN^{-}$. From the results, we concluded as follows : Optimum initial pH of wastewater was pH : 3. Amount of optimum addition of electroltyte(NaCl) was 0.1 wt%. Optimum potential for electrolysis was 5 volt. Concentration and removal efficiency for $Cr^{6+}$ and $CN^{-}$ were under 1 mg/L and above 99% at optimum conditions. And the feasibility of electrolytic treatment for electroplating wastewater containing $Cr^{6+}$ and $CN^{-}$ was certified.