Semi-automatic sealing machine is a special equipment for torsional broken aluminium bottle caps. Compared with other similar products, the advantages of the machine are as follows: firstly, the four-claw balanced head is adopted in the structure, and the force is uniform when sealing; secondly, it has the sealing function of first deforming the bottle cap according to the shape of the bottle mouth, then rolling thread and flanging. At the same time, the machine has the characteristics of beautiful appearance, compact structure, reasonable design, stable operation, low noise, fast sealing speed and good sealing quality. It is suitable for batch production of various distilleries, beverage factories, breweries, pharmaceutical factories and other enterprises. At the same time, the machine is multi-purpose and can replace the head parts. It can be used for plastic cap screw cap, three-proof cap and crown cap press cap.