The utility model relates to a decompression bottle lid, including bottle lid body and a flexiplast tie, the upper end of flexiplast tie and bottle lid body rigid coupling, the lower extreme and the plastics decompression disk rigid coupling of flexiplast tie, the external diameter of plastics decompression disk is the same with the external diameter of bottleneck, has an air guide through -hole of a plurality of full communications between the higher and lower levels in the even system in the middle part of plastics decompression disk, has holding ring, the external diameter of holding ring and the internal diameter of bottleneck formation tight fit in the coaxial system in lower part of plastics decompression disk. The utility model discloses simple structure, when opening the bottle lid, the decompression disk is being connected to the bottle lid, the decompression disk be interior the beverage of bottle through the air guide through -hole and reduces pressure, prevents that the soda from blowing out, behind pressure release, pulls out the disk that reduces pressure through the flexiplast tie and can normally drink, gets back into the decompression disk after drinking again, has adorned secondary application under the lid soon.