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Heavy metal chromium (Cr) in the metal plating industry liquid wastes are highly toxic. Heavy metal Cr on this need to be eliminated or at least demoted so simply applied a quality raw quality. The process of reduction or disappearance of Cr from metal plating industry liquid wastes can be done with the electrocoagulation process. The purpose of this research is to lower the levels of heavy metal Cr in artificial solution containing Cr as a preliminary study for determination of NaCl are added as the electrolyte and determination of processing time the optimal electrocoagulation. Research methods using experiments in the laboratory with a continuous system of electrocoagulation process using iron electrodes, with variations in processing time and addition of NaCl. Before and after electrocoagulation done the determination of the levels of heavy metal Cr solution using artificial atomic absorption spectrophotometer (SSA). The analysis in this research uses ANAVA test two way. Test of ANAVA two way shows that the value of the significance of the variation of the concentrations of NaCl and variations in processing time electrocoagulation against concentration of heavy metal Cr on artificial solution value 0.0001 (p < 0.05). The results show that there is a difference of reduction in the concentration of heavy metal Cr significant variation in terms of processing time and electrocoagulation variation of concentration NaCl. Based on those results, the conclusion to be drawn that the process of continuous system electrocoagulation with a time of 60 minutes and the addition of NaCl 1.201% w/v gave the most optimum reduction of heavy metal Cr compared to 15 minutes processing time , 30 minutes, 45 minutes and 75 minutes and the addition of NaCl 0.402% w/v; 0803% w/v and 1.601% w/v.