The　development　of　corporate　big　data　has　been　widely　recognized　as　a　significant　driver　of　internal　green　technology　innovation.　Moreover,　supply　chain　networks,　serving　as　essential　channels　for　innovation　resources,　have　substantial　potential　to　facilitate　green　technology　innovation.　However,　the　potential　spillover　effects　through　supply　chain　networks　remain　underexplored.　This　study　analyzes　how　supply　chain　partners＇　big　data　development　affects　enterprise　green　technology　innovation.　Using　the　data　of　Chinese　A-share　listed　companies　from　2012　to　2022,　we　employ　the　Word2vec　model　to　measure　supply　chain　partners＇　big　data　development.　Our　results　reveal　that　supply　chain　partners＇　big　data　development　significantly　enhances　focal　firms＇　green　technology　innovation.　Heterogeneity　analysis　demonstrates　that　the　effect　is　particularly　pronounced　for　large　companies　and　those　in　low-marketization　regions,　with　suppliers＇　big　data　development　exhibiting　a　stronger　impact　than　that　of　customers.　Notably,　technology　integration　capability　weakens　this　relationship,　whereas　market　competition　strengthens　it.　These　findings　provide　novel　insights　and　valuable　guidance　for　policymakers　seeking　to　promote　strategic　green　transformation,　thereby　supplementing　existing　literature.　©　2025　Elsevier　B.V.