Transforming　discarded　electronic　devices　into　low-cost　and　high-efficiency　catalysts　presents　a　win-win　approach　to　address　the　scarcity　of　rare　resources　and　sustainable　energy　challenges.　Herein,　we　report　an　effective　strategy　that　combines　an　ethanol-mediated　dodecylamine　(DDA)　phase　transfer　with　hydrothermal　methods　for　facilitating　the　facile　synthesis　of　indium　(In)-based　nanomaterials　from　the　leachates　of　liquid　crystal　display　panels　(LCDPs)　toward　high-efficiency　electrochemical　CO2　reduction　reaction　(eCO2RR).　In　this　strategy,　the　rapid　formation　of　coordinating　compounds　between　the　-NH2　group　of　DDA　and　metal　ions　facilitates　the　separation　of　In3+　cations　from　the　acidic　LCDPs　leach　solution　by　transferring　them　into　an　organic　phase,　which　are　then　converted　into　InOOH　nanoparticles　with　abundant　oxygen　vacancies　(denoted　as　InLCDPs　and　hereafter)　through　a　low-temperature　hydrothermal　process.　The　eCO2RR　evaluations　confirm　the　superior　electrocatalytic　performance　of　the　In-based　nanoparticles　produced　from　the　LCDPs.　In　specific,　within　a　broad　potential　range　(-0.77　to　-1.17　V　vs　RHE),　the　In-LCDPs　show　a　Faradaic　efficiency　for　formate　(FEformate)　of　85　%,　with　the　highest　FEformate　of　90.23　%　at　-0.97　V　vs　RHE,　which　is　comparable　to　the　FEformate　(93.8　%　at　-0.97　V　vs　RHE)　of　In-based　catalyst　prepared　from　pure　In　precursors　using　the　same　method.　Further　investigations　reveal　that　the　Sn　and　Al　impurities　have　minimal　impact　on　the　catalytic　performance　of　In-LCDPs,　while　the　presence　of　Fe3+　impurities　significantly　enhance　the　production　of　hydrogen　during　the　eCO2RR.　This　work　might　have　provided　a　scalable　pathway　to　transform　LCDPs　into　value-added　electrocatalysts　for　eCO2RR.