Unpowered mixing device

The utility model relates to an unpowered mixing device which comprises a U-shaped groove (2), wherein the U-shaped groove (2) is formed in the port (1) of a feeding center cylinder of a thickener, and a baffle plate (3) is arranged in the middle of the interior of the U-shaped groove and fixed on the inner wall of the U-shaped groove through a support A (4); a material mixing device (5) is arranged at the upper stream of the baffle plate (3) and fixed on the inner wall of the U-shaped groove through a support B (6); the material mixing device (5) is of a square structure, and an inlet (7) is formed in the upper top surface of the material mixing device (5) and vertically penetrates the middle of the material mixing device (5) to form an inlet pipeline (8); an outlet (9) is formed in the side, facing to the baffle plate (3), of the material mixing device (5). The unpowered mixing device is simple in structure and does not have a moving part and a transmission device, so that equipment investment is low. The unpowered mixing device is low in operation cost, does not have power consumption, fully utilizes tension of fluids, saves energy sources, reduces power consumption, and reduces the operation cost.