A pressure regulating oxygen bottle has a bottle body filled with liquid, a cap mounted on the bottle body, an outer tube mounted in the bottle body, and an inner tube mounted through the cap and protruding in the outer tube. The outer tube has multiple flow holes arranged linearly between two opposite ends of the outer tube. The inner tube is connected to an artificial respiration system and has multiple communicating holes arranged spirally between two opposite ends of the inner tube. By turning the inner tube to allow one of the communicating holes to align with a corresponding one of the flow holes of the outer tube, a hydrostatic pressure formed between a liquid surface of the liquid and the communicating hole is changed. Accordingly, gas pressure inside the artificial respiration system can be adjusted.本創作之調壓氧氣瓶,其包括一瓶蓋、一瓶身、一內管及一外管,該內管套設於該外管之內緣且裝設於該瓶蓋,該內管形成複數個沿螺旋線且垂直等距離之孔,該外管形成複數個沿直線且等距離之孔,該內管之孔與該外管之孔相對應,該瓶蓋套設於內部盛有溶液之該瓶身;內、外管之一端開口浸入於瓶身溶液內,透過內管相對於外管之轉動,改變外管之孔及內管之孔間的對合態樣,造成內、外管相對應孔與液面間深度的變化,從而調整人工呼吸系統中氣流之壓力,又因為內、外管裝設於瓶蓋,可獲得一固定裝設之功效,以改善現有技術無法精確的控制氣流壓力以及使用者必須頻繁調整該系統管路位置之缺陷。10‧‧‧瓶身11‧‧‧夾扣部15‧‧‧裝設座20‧‧‧瓶蓋211‧‧‧定位孔30‧‧‧內管31‧‧‧接口件32‧‧‧調整部33‧‧‧指標331‧‧‧定位部34‧‧‧孔40‧‧‧外管41‧‧‧承接部42‧‧‧孔43‧‧‧覆套431‧‧‧孔
