The utility model relates to the technical field of dust removers, in particular to a balance weight device of a single beater scutcher. The counter weight device is characterized by comprising balance bent levers arrayed evenly, connecting hanging parts, hanging frames, a marker post and a counter weight. The two ends of each connecting hanging component are respectively provided with a hanging ring or a hook, and the connecting hanging components are hung at the tail ends of the balance bent levers. The upper portions of the hanging frames are U-type frames, and two hanging rings or hooks are arranged on the upper portion of each U-type hanging frame. A hanging ring or a hook is arranged in the middle of the lower portion of each U-type hanging frame, the lower ends of the connecting hanging components are connected together in pairs through the hanging frames, and hanging frames are further arranged on the lower portions of the hanging frames. The marker post is arranged between the two hanging frames on the lowest portion. A guiding hole is formed in the upper portion of the counter weight, and the marker post penetrates through the guiding hole. The structure is reasonable, using and detaching are convenient, the position of the counter weight can be adjusted, the stress on the tail ends of the balance bent levers is stable, and the quality improvement of products is facilitated.