The invention relates to a double-layer medical liquid bag, which mainly creates a medical liquid bag configured as an inner and outer double-walled body. The outer wall and the inner wall are filled with clean air, and the outer wall and the inner wall are filled with clean air. A piercing device is arranged between the wall bodies. When the medical liquid in the medical fluid bag is to be used, the piercing device is advanced to pierce a piece to be pierced, so that clean air can slowly enter the inner layer. In the wall, the liquid medicine is pushed down. Therefore, during operation and use, it is completely isolated from the outside air, so as to avoid the danger of unknown air from outside and to ensure the safety of the double-layer medical liquid bag. .一種雙層式醫療用液袋，主要係創設一種構造為內外雙層式壁體之醫療用液袋，在其外層壁體與內層壁體間灌注有清潔空氣，且在外層壁體與內層壁體間設置有一刺破裝置，當要使用該醫療用液袋內之藥液時，令該刺破裝置前進去刺破一待刺破片體，使清潔空氣得以慢慢進入該內層壁體內，以推動藥液向下流出，因此在操作及使用之過程中，與外界空氣完全隔離，從而可避免外界不明空氣進入之危險性，以確保使用雙層式醫療用液袋之安全性。
