Novel locking type sealing ring

The utility model discloses a novel locking type sealing ring which comprises a supporting ring, a positioning ring and a sealing ring body, a sliding groove is formed in the peripheral wall of the lower portion of an annular cavity of the supporting ring so that the upper portion of the positioning ring can stretch into the sliding groove, and the end face of the upper portion of the positioning ring is matched with the groove wall of the sliding groove to clamp the peripheral position of the sealing ring body. The section of the peripheral position of the sealing ring is in an isosceles trapezoid shape, the face, abutting against the trapezoid waist face, of the groove wall of the positioning ring and the face, abutting against the trapezoid waist face, of the groove wall of the positioning ring and the face, abutting against the trapezoid waist face, of the sliding groove are inclined faces, a first protruding shoulder is formed on the peripheral side of the lower portion of the supporting ring, a second p