Great breakthroughs have been made in salt lake lithium extraction technology,but there are advantages and disadvantages in different processes. The comprehensive recovery and utilization of lithium extraction tail solution is an urgent issue.The recovery of lithium extraction tail solution was realized through the extraction/adsorption/electrolysis combined technology,and the battery-level lithium hydroxide monohydrate were prepared. The optimum operating conditions were determined as follows:the optimum extraction ratio（volume ratio of oil phase to water phase） was 1.5,the concentration of synergist was 0.035 mol/L,the mass fraction of anode solution was 21%~25% and the mass fraction of cathode solution was 1%~2%.Under the conditions,the prepared lithium hydroxide products met the standard requirements（LiOH·H₂O-D1） of Battery Grade Lithium Hydorxide Monohydrate,GB/T 26008—2010.This technology not only improves the utilization rate of lithium resources,but also achieved the diversification of lithium salt products.It provides a new technology route for the recovery and utilization of lithium extraction tail solution in Qinghai Salt Lake area.