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Ion concentration polarization (ICP) is a crucial method to concentrate or separate samples of charged molecules. This work utilized the principle of free flow ion concentration polarization focusing (FF-ICPF) to simulate the extraction of Li⁺ ions in high magnesium-lithium ratio (Mg²⁺/Li⁺）ratio brine. The pressure-driven flow(PDF) continuously flows through the system while Li⁺ is continuously concentrated by the ICP driven by a perpendicular electric field. Use a typically diluted salt  lake brine. Our results showed that the FF-ICPF model could increase Li+ concentration to 1.57 times while decreasing the Mg2^+/Li⁺ ratio by 94.95%.