The invention discloses a stirring device which comprises an inner cylinder, an outer cylinder and a mixing space, wherein the mixing space is positioned between the inner cylinder and the outer cylinder; the inner cylinder and the outer cylinder are coaxially arranged; a first spiral guide plate is arranged on the outer surface of the inner cylinder; a second spiral guide plate is arranged on theinner surface of the outer cylinder; the first spiral guide plate and the second spiral guide plate are in a same spiral direction; rough material mixing plates are arranged among adjacent guide pieces in an axial direction of the inner cylinder in the first spiral guide plate; fine material mixing plates are arranged among adjacent guide pieces in an axial direction of the outer cylinder in thesecond spiral guide plate. Due to adoption of a rough material baffle plate and a fine material baffle plate, in a rotation process, a fine material is thrown towards the centers of the cylinders by the fine material baffle plate, and a rough material is thrown out to the edges of the cylinders by the rough material baffle plate, so that the rough material and the fine material are relatively uniformly mixed, and uniform mixing of materials can be facilitated.