The utility model discloses a threading sealing and fixing device which comprises a sealing ring, a threading cable and a sealing ring installation base. The upper end of the sealing ring installation base is provided with a sealing ring installation cavity. The center of the sealing ring installation cavity is provided with a through hole. The sealing ring is arranged in the sealing ring installation cavity. The threading cable penetrates through an inner hole of the sealing ring. A sealing ring pressing device is arranged above the sealing ring. The threading sealing and fixing device is characterized in that the upper end of the pressing device is further provided with a hoop installation groove, the hoop installation groove is internally provided with a hoop arranged on the threading cable in a sleeving mode, and the a hoop pressing device is further arranged above the hoop. The threading sealing and fixing device has the advantages that the problem that in the prior art, the threading cable and a sealing device slide when the threading cable is pulled by external force is eliminated completely, and the hoop compresses the threading cable to generate deformation so as to achieve limiting and fixing. When the threading sealing and fixing device is installed, fixing of the threading sealing and fixing device is achieved only by adjusting the pressure of the pressing device, and the device is convenient to disassemble and assemble.