The　coordination　of　multiple　luminescent　centers　in　a　simple　and　efficient　way　is　a　difficult　challenge　for　realizing　the　tunable　multicolor　function　of　fluorescent　hydrogels.　In　this　work,　we　synthesized　a　fluorescent　hydrogel　with　multicolor　conversion　via　a　＂one-pot　method,＂　which　greatly　simplifies　the　tedious　steps　of　preparing　fluorescent　hydrogels.　The　luminescence　intensity　and　color　of　the　synthesized　DPA-Eu/TPE@PVA　hydrogel　can　be　modulated　by　various　stimuli,　such　as　the　excitation　wavelength,　pH,　and　presence　of　Fe3+　ions.　The　entire　work　centers　on　the　rational　introduction　of　the　light-emitting　molecule　tetrakis(4-hydroxyphenyl)ethylene　(TPE-4OH)　and　the　lanthanide　ionic　complex　2,6-pyridinedicarboxylic　acid-Eu　(DPA-Eu)　into　the　poly(vinyl　alcohol)　(PVA)　polymer　network.　Since　the　luminescence　mechanisms　of　these　two　molecules　differ,　with　the　former　emitting　light　with　the　aid　of　the　aggregation-induced　emission　(AIE)　effect　and　the　latter　emitting　light　through　energy　transfer　via　metal　dynamic　coordination　bonds,　individual　luminescent　molecules　can　be　controlled　independently　under　specific　stimuli.　The　realization　of　this　tunable　multicolor　fluorescence　function　has　contributed　to　its　application　in　fields　such　as　sensors,　probes,　and　information　encryption.