. A bottle sealing structure comprising:
a bottleneck provided in an outer wall with an outer threaded portion;
a cap provided in an inner wall with an inner threaded portion which is engaged with said outer threaded portion of said bottleneck; and
a sealing ring attached to a bottom end of said cap by a plurality of connection points which are arranged at intervals and are separated from one another by a plurality of gaps;
wherein said bottleneck is further provided in the outer wall with a retaining ring whereby said retaining ring is located under said outer threaded portion; wherein said sealing ring is provided along a bottom fringe with a retaining portion whereby said retaining portion is retained by said retaining ring of said bottleneck.