The utility model provides an opening structure of cork wood bottle stopper. The utility model is provided with a sleeve and a lifting shaft contained in the sleeve. A cock bar capable of driving the lifting shaft move up and down along the sleeve is pivoted on the out side of the sleeve. A set of knife cutting bar is set with space at the bottom of the lifting shaft and cutting edge is arranged at the bottom of the knife cutting bar so that when the sleeve is fastened to the bottleneck, the cock bar can control the lifting shaft move down and then drive the cutting edge insert into the cork wood bottle stopper. An elastic clamping piece is arranged on the upper part of the cutting edge of the knife cutting bar. The elastic clamping piece can automatically revert and extend out passing through the bottom of the cork wood bottle stopper. When the cock bar control the lifting shaft move up, the elastic clamping piece can be fastened and bunt at the bottom of the cork wood bottle stopper to pull out the cork wood bottle stopper synchronously, which forms an opening structure capable of pulling out the whole bottleneck of the cork wood bottle stopper up and down straightly.