The self-healing phenomenon,refers to the damage parts can repair or mend themselves and restore their previous properties after impair,which can be found on the skin in animals and the branch grafted onto the tree,is an amazing occurrence in nature.Mimicking the nature to confer synthetic materials with self-healing property in order to expand their lifespan is highly desirable and has attracted much more attention from the scientific community.But poor electrochemical property of the fabricated self-healing materials limit current and future application.Here,self-healing multilayer polyelectrolyte film based on branched poly(ethyleneimine)(bPEI),Poly(acrylic acid)(PAA)and graphene(GE)(bPEI/(PAA-GE))was prepared with layer-by-layer(LBL)self-assembly technique.The bPEI/(PAA-GE)self-healing multilayer polyelectrolyte film not only shows excellent self-healing ability at high humidity,but also possesses good electrical conductivity.It is promised to be applied in battery,supercapacitor or hydrogen fuel cell to improve their cyclic stability and lifetime.