Laminated flexible hydrogel-based supercapacitors have been investigated extensively to satisfying the progressive requirements of wearable devices. However, the thermal and multilayer instability are the critical obstacles to apply in practice. Toward this, a self-healing polymeric eutectogel with recyclable ability and superior thermal stability is developed to obtained all-gel-state integrated supercapacitors that simultaneously possess full-device self-healability, stretchability and high temperatures stability. The assembled eutectogel-based supercapacitor can provide a maximum areal capacitance of 24.9 mF/cm2 at a current density of 0.05 mA/cm2. The non-laminate configuration can avoid delamination and slippage, which endow the supercapacitor high stretchability of over 200 %. Otherwise, the supercapacitors could regain the electrochemical performance through their self-healing under the circumstance of mechanical damage with an excellent self-healing efficiency approaching 94.6 % after 5 cut/healing cycles. Most importantly, the supercapacitors feature prominent environmental stability at high temperature of 60 °C. This work presents an innovative polymeric eutectogel system as a promising platform for flexible energy storage applications with electrochemical stability and environmental adaptability.