To　obtain　a　flexible　supercapacitor　with　excellent　capacitance,　good　mechanical　properties　while　maintaining　self-healing　ability,　β-NiS/Ti3C2Tx　with　2D/2D　heterostructure　was　synthesized　by　hydrothermal　reaction　and　introduced　as　filler　to　the　polymer　hydrogel　PAA/CS(PC)　network.　Through　mechanical　and　self-healing　performance　tests,　it　was　found　that　the　hydrogel　electrode　had　high　tensile　properties　with　tensile　strain　up　to　566%　and　excellent　self-healing　properties　with　efficiency　as　high　as　84%.　The　electrode　not　only　exhibits　a　specific　capacitance　of　10.92　F/g　at　a　current　density　of　6　mA/g,　but　also　still　shows　an　excellent　stability　of　87%　at　a　high　current　density　of　20　mA/g　for　2000　cycles.　This　novel　hydrogel　facilitates　the　further　development　of　multifunctional,　smart　and　flexible　electronics.　©　2021