The invention discloses a hybrid material graphene/ZnO for photocatalytically degrading fungaltoxin. The hybrid material graphene/ZnO is prepared from graphene oxide and a nanometer photocatalyst ZnO according to the mass ratio being (0.1-10):100 through a hydro-thermal synthesis method. In addition, the influence of the hybrid material graphene/ZnO on photocatalytic degradation of the fungaltoxin is inspected through the conditions of the graphene modifying amount, photodegradation time and the like. The high-activity hybrid material graphene/ZnO is prepared through the hydrothermal method, the process is simple, the hybrid material graphene/ZnO is suitable for industrial volume production, the photocatalytic degradation technology is applied to the field of fungaltoxin degrading, and high application prospects and practical value are achieved.