▎ 摘　　要

NOVELTY - Method for preparing graphene in large scale, comprises crushing the waste paper and carbonizing under the protective atmosphere condition to obtain carbonized product, performing ultrasonic treatment to the carbonized product in the hydrochloric acid solution, washing and drying to obtain the graphene. USE - The method is useful for preparing graphene in large scale. ADVANTAGE - The method has low device requirement, simple and safe process, does not need additional catalyst, reduces production cost, and is environmentally friendly, and the raw material used is waste paper, which is cheap and easy to obtain, and suitable for large-scale application and production in industry. The graphene has good electrical properties when used in supercapacitor. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a graphene prepared by the above mentioned method; and (2) a supercapacitor, comprising the graphene.