The　flexible　organic　phototransistors　(OPTs)　are　crucial　for　next-generation　wearable　systems　for　applications　where　large　mechanical　deformation　is　involved.　However,　most　of　the　reported　OPTs　utilizing　the　field-effect　transistor　(FET)　architecture　suffer　from　undesired　mechanical　flexibility　and　limited　performance　due　to　their　interfacial　charge　transport　and　inherently　low　transconductance;　moreover,　their　π-conjugated　semiconductor　polymers　that　serve　as　channels　lack　specific　healing　sites,　making　it　difficult　to　intrinsically　heal　themselves.　Herein,　a　more　flexible　and　high-performance　OPT　with　enhanced　interfacial　charge　transport　via　novel　volumetric　channel　and　strong　healing　capability　is　developed　for　the　first　time.　This　OPT　utilizes　an　organic　electrochemical　transistor　architecture　that　consists　of　intrinsically　healing　conducting　polymer/hydrogel　composite　films　with　three-dimensional　volumetric　channels.　Such　devices　not　only　efficiently　restore　their　mechanical　and　electrical　performance　in　100　ms　after　undergoing　severe　damage　but　also　exhibit　excellent　mechanical　flexibility　without　obviously　degraded　performance.　More　importantly,　the　self-healing　OPTs　exhibit　high　performance　with　a　responsivity　as　high　as　1.01　×　105　A　W−1,　detectivity　of　1.75　×　1012　Jones,　and　high　external　quantum　efficiency　of　3.03　×　104%,　higher　than　those　of　the　majority　of　the　reported　FET-based　OPTs.　All　of　these　results　indicate　that　these　novel　and　intrinsically　self-healing　OPTs　with　volumetric　channels　are　ideal　for　use　in　next-generation　wearable　devices.　(Figure　presented.)　©　Science　China　Press　2024.