The invention provides a storing bag with a simple structure and a good sealing effect. The storing bag comprises a bag body, wherein the bag body comprises a first outer film layer and a second outer film layer, at least one heat-sealing line is arranged between the first outer film layer and the second outer film layer, an opening is formed in the bag body, a sealing strip capable of being opened and closed is arranged at the edge part of the opening, and a one-directional air valve film is further arranged in a position, different from the opening, on the bag body. The one-directional air valve film comprises a first inner film layer and a second inner film layer which are auto-adhesive, and the first inner film layer and the second inner film layer are arranged between the first outer film layer and the second outer film layer. A heat resisting block is arranged between the first inner film layer and the second inner film layer, and the heat resisting block is coated with a heat resisting material. The heat-sealing line passes the first inner film layer, the second inner film layer and the heat resisting block. After air in the bag body is discharged from the one-directional air valve film, the first inner film layer and the second inner film layer are auto-adhered, external air is prevented from flowing back into the bag body, and the sealing effect is great. The structure of the one-directional air valve film is simple, and the manufacture cost of the storing bag is low.