Quick cutter for explosion-proof sealing ring and cutting method thereof

The quick cutter comprises a sealing ring fixing pin and a moving knife rest, a rotating handle is welded to one end of the sealing ring fixing pin, a vertically-penetrating first mounting hole is formed in the middle of the sealing ring fixing pin, an adjusting rod is inserted into the first mounting hole, and a penetrating second mounting hole is formed in the moving knife rest; a third mounting hole perpendicular to the second mounting hole is formed in the moving tool rest, and a cutting tool is inserted into the third mounting hole; the invention further discloses a cutting method of the quick cutter for the anti-explosion sealing ring. The cutting method comprises the steps that the inserting length of the adjusting rod is adjusted, and the adjusting rod is locked; a sealing ring fixing pin is inserted into a center hole of the anti-explosion sealing ring; the position of the moving tool rest relative to the adjusting rod and the cut-in angle of the cutting tool are adjusted and locked; the extension le