The aminated beta-cyclodextrin (beta-CD-N) molecules were first used to modify graphene for fabricating the hybrid film electrode (G/beta-CD-N) using a method combining mild water bath heat-treatment and vacuum filtration. As compared with pure graphene film (G) and beta-cyclodextrin (beta-CD) modified graphene film (G/beta-CD), the prepared G/beta-CD-N hybrid film exhibits better hydrophilic property, thermal stability and higher mechanical flexibility. Particularly, the G/beta-CD-N hybrid film has a remarkably high areal specific capacitance (614 mF cm(-2) at 0.5 mA cm(-2)), good mechanical flexibility (maintaining 98.2% for 1000 bending/unbending cycles) and long-term cycle stability (maintaining 96.8% for 10000 charge/discharge cycles). Moreover, the assembled G/beta-CD-N based flexible and symmetric all-solid-state supercapacitor shows an excellent volumetric specific capacitance of 22.53 F cm(-3) at 0.5 mA cm(-2) and a high energy density of 3.13 mWh cm(-3) at a power density of 0.014 W cm(-3). The high comprehensive performances of the developed hybrid film electrodes can be ascribed to the combined effects of beta-CD molecules and the amination process. This work provides a new approach for the fabrication of flexible supercapacitor with high performance. (c) 2019 The Electrochemical Society.