The　integrated　development　of　various　industries　in　China　is　essential　for　promoting　long-term　sustainable　development　and　achieving　carbon　neutrality.　In　this　study,　we　analyze　panel　data　from　30　Chinese　provinces　(excluding　Tibet,　Hong　Kong,　Macao,　and　Taiwan)　covering　the　period　between　2005　and　2020　to　investigate　the　impact　of　collaborative　agglomeration　between　productive　service　and　manufacturing　industries　on　green　development　efficiency.　We　utilize　a　mediation　effect　model　to　examine　the　role　of　technological　innovation　in　driving　the　relationship　between　industrial　collaborative　agglomeration　and　regional　green　development　efficiency.　Our　findings　reveal　that　the　collaborative　agglomeration　of　the　productive　service　and　manufacturing　industries　has　a　significant　positive　effect　on　improving　regional　green　development　efficiency.　We　also　identify　a　non-linear　relationship,　indicating　a　double　threshold　effect.　Technological　innovation　plays　an　important　role　in　facilitating　industrial　collaborative　agglomeration　and　promoting　the　efficiency　of　regional　green　development.　Moreover,　our　results　demonstrate　significant　regional　heterogeneity　in　the　impact　of　industrial　collaborative　agglomeration　on　regional　green　development　efficiency.　Based　on　these　findings,　we　propose　several　policy　recommendations　to　achieve　high-quality　regional　economic　development,　including　improving　the　quality　of　industrial　synergy　and　agglomeration　between　regions,　strengthening　the　intermediary　promotion　role　of　technological　innovation,　and　enhancing　regional　green　productivity.