Sealing and fixing device for improving online maintenance efficiency of roller box

The utility model discloses a sealing and fixing device capable of improving online maintenance efficiency of a roller box, which belongs to the technical field of roller box sealing and comprises a retainer and a double-lip sealing ring mounted on an inner ring of the retainer, the inner ring of the retainer is provided with a first step groove formed from top to bottom, the double-lip sealing ring comprises a double-lip rubber ring and a framework ring, the framework ring is arranged in the middle of the outer ring of the double-lip rubber ring, a second step groove is formed in the outer ring of the framework ring from bottom to top, and the second step groove is matched with the first step groove. When the double-lip sealing ring is replaced, the retainer does not need to be detached, so that impurities can be prevented from entering the roller box, the service life of the roller box is prolonged, a special tool is not needed during installation, the installation is simpler, the inspection mode after inst