▎ 摘　　要

NOVELTY - A graphene-based supercapacitor preparing method involves treating natural crystalline flake graphite with strong acid, carrying out rapid expansion at 900-1000 degrees C, ultrasonically peeling in an ultrasonic reactor for 6-8 hours, washing and drying to obtain the finished product. USE - Method for preparing graphene-based supercapacitor. ADVANTAGE - The method enables preparing graphene-based supercapacitor with better electrical conductivity, large specific surface area, better capacitor performance and better adsorption active point.