A biaxial stretching method for manufacturing waterproof and moisture-permeable PE film comprises: extruding molten PE raw materials and fillers by an extruder die so as to form a thermoplastic extrusion extending the thermoplastic extrusion toward a cross direction (CD) by wind power blown from a plurality of air outlets of the extruder die so as to form a thermoplastic film bubble receiving the thermoplastic film bubble by a first roller set having a first velocity at a first temperature so as to form a thermoplastic PE film and receiving the thermoplastic PE film by a second roller set having a second velocity at a second temperature so as to draft the thermoplastic PE film toward a machine direction (MD).本發明係揭露一種透濕防水PE膜之雙軸向製備方法,包含:利用押出機將熔融狀態之PE原料及填充物由押出機之模頭押出,以形成熱塑性押出物;利用模頭之唇口之複數個噴風口所吹出的風力將熱塑性押出物朝著垂直膜體輸送方向(CD)展開,以擴張成熱塑性膜泡;利用具有第一轉速之第一滾筒組在第一溫度下接收熱塑性膜泡,以令熱塑性膜泡形成熱塑性PE膜;以及利用具有第二轉速之第二滾筒組在第二溫度下接收熱塑性PE膜,以朝著膜體輸送方向(MD)牽伸熱塑性PE膜。S100、S110、S120、S130、S140‧‧‧步驟
