The automatic quantitative packaging machine is a new type of medium and high-precision powder quantitative packaging machine with simple and reasonable structure. Bag clamping device and auxiliary air conveying device. In order to ensure the measurement accuracy, it is equipped with three feed speeds of high speed, medium speed and low speed. When the set weight is reached, the bag is released and the machine stops automatically. It is a machine with high packaging efficiency, high packaging precision and labor saving. It is suitable for the packaging of various powdery materials, such as putty powder, talc powder, calcium powder, kaolin, bauxite, dyes, diatomite, silica powder and other powdery materials.