Automatic packaging machines are generally divided into semi-automatic packaging machines and automatic charter machines. Automatic packaging machine is mainly used for automatic packaging of food, medicine, chemical and other industries and plant seeds. The material can be in the form of granules, tablets, liquids, powders, pastes and the like. The automatic packaging machine has the functions of automatic measurement, filling, bag making, sealing, cutting, conveying, printing of production batch numbers, adding of easy-cutting, no material warning, and stirring. The automatic packaging machine has advanced design, reasonable structure and reliable performance. The automatic packaging machine adopts double synchronous belts to pull the film, and the tension is controlled by the cylinder, automatic correction, automatic alarm protection function, to minimize the loss. The metering device is matched with the bagging, filling, filling, printing and counting. The device can be modified according to the material conversion method.