The invention relates to a graphene preparation method, which comprises: 1, preparing a working electrode, wherein graphite is pressed on a stainless steel current collector so as to be adopted as a working electrode of a three-electrode system, 2, preparing intercalation graphite, wherein the three-electrode system is adopted to prepare intercalation graphite, 3, washing, wherein deionized water is adopted to wash the intercalation graphite, 4, carrying out vacuum drying, 5, carrying out microwave stripping, wherein the dried intercalation graphite is taken and added to an ion liquid according to a certain mass volume ratio, and the obtained mixture is placed into a microwave oven to carry out stripping, 6, washing, wherein filtration is performed by using organic solvent, and washing is performed by using deionized water until the pH value is neutral, and 7, carrying out vacuum drying. According to the present invention, the graphene preparation method has characteristics of simple operation and easy industrialization achievement, the yield of the graphene prepared by using the graphene preparation method is high, and the single layer rate of the graphene is up to more than 60%.