In　the　wake　of　the　2011　Fukushima　nuclear　disaster,　the　presence　of　radioactive　cesium　(Cs-137)　in　nuclear　wastewater　has　posed　a　critical　and　enduring　health　risk.　Addressing　this　challenge,　we　have　synthesized　a　gelatin　aerogel,　denoted　as　KCuFC/GA,　immobilized　with　potassium　cupric　ferrocyanide　(KCuFC)　through　an　in　situ　approach,　aiming　for　the　efficient　extraction　of　Cs-137　from　aqueous　environments.　This　novel　aerogel＇s　rich　porous　structure　enhances　the　accessibility　of　adsorption　sites,　thereby　significantly　promoting　the　capture　of　Cs+.　The　adsorption　of　cesium　onto　KCuFC/GA　was　investigated　under　various　experimental　conditions,　including　initial　solution　pH,　contact　time,　initial　cesium　concentration,　and　the　presence　of　coexisting　ions　(K+,　Na+,　Ca2+,　Mg2+,　Sr2+).　The　results　indicated　that　the　adsorption　performance　was　largely　independent　of　pH,　achieving　a　high　cesium　removal　rate　of　93.4　%　within　the　first　5　minutes.　The　cesium　adsorption　data　were　well-described　by　the　Langmuir　adsorption　model,　indicating　a　maximum　adsorption　capacity　of　222.22　mg　center　dot　L-1.　Furthermore,　in　the　presence　of　various　competing　ions,　KCuFC/GA　has　demonstrated　unparalleled　selectivity　for　Cs+,　with　a　partition　coefficient　(Kd)　of　2.49　x　10(5)　mL　center　dot　g(-1),　and　has　sustained　its　adsorptive　properties　across　five　cycles　of　use.　Through　systematic　investigation,　including　X-ray　photoelectron　spectroscopy　(XPS)　analysis,　we　have　elucidated　the　adsorption　mechanism,　highlighting　the　pivotal　role　of　ion　exchange　between　lattice　K+　and　Cs+.　The　straightforward　fabrication　process　and　the　aerogel＇s　robust　cesium　removal　capabilities　from　complex　solutions　indicate　that　KCuFC/GA　is　a　promising　candidate　for　real-world　applications　in　the　treatment　of　radioactive　wastewater.