Method for massively preparing high-quality graphene

The invention discloses a method for massively preparing high-quality graphene. The method comprises the following steps of mixing a stripping agent and water, preparing a stripping agent solution of which the concentration is 0.2 to 50 weight percent; dispersing expanded graphene into the stripping agent solution in a mass ratio of the expanded graphene to the stripping agent solution of (0.1-10):100, stirring and dipping for 1 to 10h; and performing ultrasonic treatment for 5 to 300 minutes, filtering, washing and drying to obtain the graphene. The method has the advantages that the method is mild in preparation condition and easy to operate, and massive production is easily realized.