The invention relates to an electrical system for preparing a graphene ultrasonic device. The electrical system comprises an ultrasonic driving power module, a flow control module and an automatic exhaust valve control module, wherein the ultrasonic driving power module is used for driving an ultrasonic driving power supply; the flow control module is used for adjusting the frequency of the ultrasonic driving power and realizing monitoring for the flow; the solenoid valve S2 of the automatic exhaust valve control module is switched on/off, so as to realize regulation for pressure in a reaction kettle. The electrical system provided by the invention has the advantages of simplicity in design, convenience in operation and easiness in maintenance. According to the design, six ultrasonic vibrators can simultaneously work, the production efficiency can be increased and the high quality property of the graphene product can be guaranteed. The flow control module and the automatic exhaust valve control module are especially designed, so that the automatic control on flow and exhaust valve can be realized and the quality of the peeled graphene and the normal peeling process of graphene are guaranteed. The electrical system has a certain promoting function for the preparation of graphene product.