The utility model discloses a protection device for open -air gas pipeline aims at providing a protection device for open -air gas pipeline that can effectively prolong the right trachea way life -span. It includes the steel sheet with the electrically conductive bonding of gas pipeline outer wall, is connected and buries underground in the anode block of subsurface through cable and steel sheet to and set up in the polyethylene adhesive tape of gas pipeline outer wall and cladding steel sheet, the cable adopts welded?connection with the steel sheet. The utility model has the advantages of the expense is low, the performance is high, safe and reliable, easy and simple to handle, construction rapidly, economic benefits is showing, can prevent effectively that high -pressure gas pipeline from suspending among the protection process pipeline in midair and by oxidative corrosion, improving the gas pipeline and suspend security of protection in midair.