Sealing ring and multi-channel single-port laparoscopic surgery puncture outfit

The invention relates to a sealing ring. The sealing ring comprises four sealing ring monomers, wherein each sealing ring monomer comprises a circular ring piece and a conical sealing piece which extends downwards on an inner ring of the circular ring piece, and a through hole is formed in the center of the conical sealing piece; a circular ring notch is arranged on the circular ring piece, and asealing piece notch is arranged at the corresponding position on the conical sealing piece; the four sealing ring monomers are overlapped, the circular ring notch and the sealing piece notch of the four sealing ring monomers are mutually staggered, namely, the circular ring notch and the sealing piece notch of each sealing ring monomer are positioned at positions where the circular ring notch andthe sealing piece notch are not arranged on the adjacent sealing ring monomer; and a plurality of positioning holes are arranged on the circular ring piece. The sealing ring is used for a multi-channel single-port laparoscopic