Automatic pouch bag in box filling machine is designed to handle quantitative bag-in-box filling operations. It adopts flow meter to automatically control the quantity of each discharging, with high filling precision, intuitive and simple filling quantity setting and adjustment action. With novel design and reasonable and compact structure, this equipment can automatically complete the processes of opening cap, quantitative filling, vacuum pumping and capping. It can be widely used in the bag-in-box filling of liquor, edible oil, fruit juice, additives, milk, syrup, alcoholic beverages, concentrated seasoning and other liquid materials.