Preparation method for graphene gel

The invention belongs to the field of graphene and discloses a preparation method for a graphene gel. The preparation method comprises the following steps: adding graphite oxide into a solvent and performing ultrasonic dispersing to prepare a graphene oxide suspension; putting the graphene oxide suspension into a reactor, sealing, and performing heating pressurizing reaction to obtain a graphene wet gel; and performing heating pressurizing processing on the graphene wet gel to obtain dry graphene gel. According to the provided preparation method for the graphene gel, by utilizing the characteristics of a supercritical solvent, the graphene gel and the dry graphene gel are prepared, and the preparation process is preformed in the reaction kettle and is relatively convenient. When the solvent is heated to the supercritical point for drying, capillary force generated during removing of the solvent in the graphene gel is eliminate, and collapse of the graphene gel structure caused by solvent removing is avoided.