Three-head scale bag-type granular packaging machine, integrating automatic bag picking, weighing, filling, and sealing, suitable for various granular materials (such as grains, powders, and plastic pellets), with a weighing error of ≤±1%. The equipment is compatible with pre-made bags and supports stand-up pouches, flat pouches, etc., with a packaging speed of 30-40 bags per minute. It is widely used in the automated packaging of granular products in the food, pharmaceutical, and chemical industries.