Graphene multi-stage screening device with drying function

The graphene multi-stage screening device with the drying function comprises an outer shell, a hot air blower and a screening groove assembly installed in an inner cavity of the outer shell, and the screening groove assembly comprises a first-stage screening groove, a second-stage screening groove and a third-stage screening groove which are vertically distributed along the inner cavity of the outer shell from top to bottom; the first-stage screening groove and the second-stage screening groove are respectively connected with a transversely arranged lead screw motor, the third-stage screening groove is connected with a vibration motor to form a multi-stage screening structure, and the multiple hot air blowers are respectively arranged above the first-stage screening groove, the second-stage screening groove and the third-stage screening groove; by arranging a multi-stage screening structure, graphene with different particle sizes can be finely screened, meanwhile, a hot air blower arranged in a surrounding mo