Pneumatic quantitative sausage stuffing machine is a three-in-one sausage enema machine (quantitative, enema, and automatic knotting of casings). The sausage can be automatically knotted without tying wires, and can be eaten directly, saving labor, high cost performance, low power consumption, no space occupation, with automatic cleaning function, the diameter of the intestine, the speed of enema, and the thickness of the intestine can all be adjusted! Biological, protein, and plastic casings can all be used, making transportation easy.