Currently, developing supercapacitors with robust cycle stability and suitability for wide-temperature-range operations is still a huge challenge. In the present work, few-layer hexagonal boron nitride nanosheets (h-BNNSs) with a thickness of 2?4 atomic layers were fabricated via vacuum freeze-drying and nitridation. Then, the h-BNNSs/reduced graphene oxide (rGO) composite were further prepared using a hydrothermal method. Due to the combination of two two-dimensional (2D) van der Waals-bonded materials, the as-prepared h-BNNSs/rGO electrode exhib-ited robustness to wide-temperature-range operations from ?10 to 50℃. When the electrodes worked in a neutral aqueous electrolyte (1 M Na2SO4), they showed a great stable cycling performance with almost 107％ reservation of the initial capacitance at 0℃ and 111％ at 50℃ for 5000 charge?discharge cycles.