The portable storage bag comprises a storage bag body, the storage bag body is provided with a bottom face and a cover face, the bottom face is connected with the adjacent inner side edge of the cover face, the cover face is movably arranged on the bottom face in a matched mode, and the outer side edge, the upper edge and the lower edge of the bottom face are movably connected with the outer side edge, the upper edge and the lower edge of the cover face in a matched and attached mode respectively. A storage bag cavity is formed between the cover surface and the bottom surface; an upper fixing piece and a lower fixing piece are arranged in the middle of the upper edge and the lower edge of the bottom face and the middle of the lower edge of the cover face respectively, the upper portion of the catheterization bag is movably limited and fixed to the upper fixing piece in a matched mode, and the lower portion of the catheterization bag is movably limited and fixed to the lower fixing piece in a matched mode. According to the utility model, the catheterization bag can be placed, observed, carried and used, the position of the catheterization bag can be better limited and fixed, the position of the catheterization bag is prevented from sliding when the catheterization bag is carried and used, meanwhile, the catheterization bag can be better hidden and placed, and the privacy of a user is protected.