Dried food fresh-keeping packaging bag structure

A dried food fresh-keeping packaging bag structure, comprising a packaging bag and a fresh-keeping exhaust valve disposed in the packaging bag, the packaging bag being provided with at least one air vent for an interior of the packaging bag to communicate with the outside, the fresh-keeping exhaust valve comprising a valve body, a valve plate and a preservative;

• the valve body being provided with a partition to partition its internal space into a valve chamber and a filling chamber;
• the partition being formed with at least one through hole so that the valve chamber and the filling chamber communicate with each other through the through hole;
• the valve plate being disposed in the valve chamber, an outer peripheral edge of an open end of the valve chamber being provided with a flange extending radially outwardly, the flange being located inside the packaging bag, having a surface attached to an inner side surface of the packaging bag relative to the air vent so that the valve chamber communicates with the outside through the air vent;
• the preservative being disposed in the filling chamber, an inlet end of the filling chamber being provided with a first breathable film to confine the preservative within the filling chamber, an outer surface of the first breathable film being provided with a first sealing film, one end of the first sealing film extending to an outside of a mouth of the packaging bag to form a pull portion.