As　the　core　component　of　wearable　electronic　devices,　flexible　energy　storage　materials　play　an　irreplaceable　role.　At　present,　it　is　still　a　challenge　to　prepare　flexible　electrode　materials　with　high　energy　density.　In　this　paper,　a　polyaniline-based　composite　flexible　conductive　hydrogel　(PPG-P)　with　a　two-level　conductive　network　is　successfully　prepared　by　a　secondary　induced　assembly　in　situ　polymerization　method.　The　special　conductive　structure　greatly　promotes　the　efficiency　of　charge　transfer　and　the　utilization　of　electroactive　substances,　so　that　PPG-P　exhibits　excellent　electrochemical　performance.　In　a　three-electrode　system,　PPG-P　has　a　mass-specific　capacitance　as　high　as　989 F　g−1　(0.5 A　g−1).　After　1000　charge　and　discharge　cycles,　the　capacitance　retention　is　87%.　Symmetrical　flexible　supercapacitors　based　on　PPG-P　have　high　specific　capacitance　(176 F　g−1/0.5 A　g−1)　and　high　energy　density　(15.6　Wh　kg−1).　After　1000　cycles　of　constant　current　charge　and　discharge,　the　capacitance　maintains　78.1%.　The　preparation　of　PPG-P　with　a　hierarchical　structure　demonstrates　the　possibility　of　achieving　high　energy　density　in　flexible　electrode　materials,　which　has　great　application　potential　in　the　development　of　energy　storage　elements　in　wearable　devices.　©　2022　Wiley-VCH　GmbH.