The invention discloses a structure for connecting a finish mold and a port ring. The structure comprises the finish mold and the port ring, wherein a first through hole and a second through hole through which a punching head moves in and out are respectively formed in the finish mold and the port ring; the port ring is arranged in the finish mold and consists of a retainer ring and a support ring which are integrated; the support ring is arranged above the retainer ring, and the diameter of the support ring is smaller than that of the retainer ring; a first clamping groove and a second clamping groove which are respectively matched with the retainer ring and the support ring are formed in the finish mold; the retainer ring is clamped in the first clamping groove; the support ring is clamped in the second clamping groove; the first clamping groove and the second clamping groove are annular grooves; the width of the first clamping groove is 0.7 to 1.0cm; and the width of the second clamping groove is 0.2 to 0.3cm. By adopting the structure, the contact surfaces of the port ring and the finish mold are reduced, so that the mold-opening amplitude is effectively reduced, the joint close line of a bottle is improved, and the processing quality of the bottle is improved.