This study presents a solar-driven membrane separation method for directly extracting lithium from artificial salt-lake brine. The approach combines an ion separation membrane with a solar-driven evaporator, inspired by the selective ion uptake and salt secretion processes in mangroves. The system consists of three layers: a photothermal layer for water evaporation, a hydrophilic porous membrane for generating capillary pressure, and an ultrathin ion separation membrane that allows Li⁺ to pass through while blocking multivalent ions like Mg²⁺. This design enables efficient lithium extraction, reducing the Mg²⁺/Li⁺ ratio by 66 times when treating brine with a salt concentration of 348.4 g L⁻¹. The process directly produces LiCl powder, offering an efficient and sustainable lithium extraction method. The solar evaporator maintains stable lithium enrichment even with high-concentration brine, demonstrating its potential for practical applications. The study highlights the effectiveness of integrating ion separation with solar evaporation for lithium recovery, providing a promising approach for sustainable lithium supply.This study presents a solar-driven membrane separation method for directly extracting lithium from artificial salt-lake brine. The approach combines an ion separation membrane with a solar-driven evaporator, inspired by the selective ion uptake and salt secretion processes in mangroves. The system consists of three layers: a photothermal layer for water evaporation, a hydrophilic porous membrane for generating capillary pressure, and an ultrathin ion separation membrane that allows Li⁺ to pass through while blocking multivalent ions like Mg²⁺. This design enables efficient lithium extraction, reducing the Mg²⁺/Li⁺ ratio by 66 times when treating brine with a salt concentration of 348.4 g L⁻¹. The process directly produces LiCl powder, offering an efficient and sustainable lithium extraction method. The solar evaporator maintains stable lithium enrichment even with high-concentration brine, demonstrating its potential for practical applications. The study highlights the effectiveness of integrating ion separation with solar evaporation for lithium recovery, providing a promising approach for sustainable lithium supply.