The utility model relates to a door, window technical field, especially a sealing device and two sealing door, sealing device is including linking location portion and sealing as an organic whole, and its cross sectional shape is T and appears, the sealing is placed in the clearance of waiting to seal, location portion is used for the laminating at the face of clearance both sides, and two sealing door have adopted sealing device to seal, and the sealing device's sealing method is simple, and the solve uses the sealed not tight problem of traditional sealing device, effectively blocks the sealed environment and communicates with each other with external environment, makes the sealed environment be in relative state of keeping apart, realizes the sealed effect in the sealed environment, is applied to two sealing door with sealing device, makes two sealing door have better leakproofness, reaches sealed effect.