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This work presents a study on electrochemical formation of Mg-Li-Al alloys on an inert electrode (Mo electrode) in a molten KCl-LiCl-AlCl₃-MgCl₂-KF system. It aims at preparation Mg-Li-Al metal alloy directly under an optimal electrolytic parameters. Main factors which affect current efficiency are investigated. We have discussed the co-electrodeposition conditions and the effect of technical parameters on these experiments, and gained a good electrolytic process. The result of calculation shows that co-electrodeposition Mg, Li and Al occurs at the cathode current density higher than 9 A/cm² and electrolytic voltage between 6 to 9 V. And at the optimal parameters, 12-13 A/cm², 620-640 ℃, the highest current efficiency reaches as high as 86 %. Lithium combined with magnesium forms Li_0.92Mg_4.08 and Li₃Mg₇, and aluminum mainly exists in a form of Mg_0.58Al_0.42, distributing in the alpha phases and beta phases.