The three-layer coextrusion film blowing machine is installed. The three-layer coextrusion film blowing production line adopts new high-efficiency and low-energy consumption extrusion unit, IBC film bubble internal cooling system, ± 360 ° horizontal up traction rotation system, photoelectric automatic deviation correction device, full-automatic winding and film tension control, computer screen automatic control system and other advanced technologies. Compared with similar equipment, it has the advantages of higher output, good product plasticization, low energy consumption and simple operation, completely solves the problems of film ruffle and winding head, and improves the product quality to a new level. The produced film has high transparency, puncture resistance, high toughness, good low-temperature heat resistance, good composite fastness and anti crimping. This film can be widely used in light and heavy packaging because of its good barrier, fresh preservation, moisture resistance, frost resistance, oxygen resistance and oil resistance. Such as all kinds of fresh fruits, meat food, pickles, fresh milk, liquid drinks, medical supplies, etc.