The device is suitable for the field of line operation and maintenance. The detachable power transmission line anti-external-damage height limiting fence comprises two vertical rods and a cross rod, aground auger is installed at the bottom of each vertical rod, each vertical rod and each cross rod are formed by splicing a plurality of stainless steel pipes, two connecting pieces are installed oneach vertical rod in the height direction, and the connecting pieces are connected with a ground anchor through the tail ends of steel wire ropes. The height limiting fence is formed by splicing the stainless steel pipes, the ground auger is detachably connected with the basic stainless steel pipe, is of a spiral structure, is made of steel, is driven into soil through a hand drill, is convenientand fast to use, does not need to be poured with concrete, is convenient to disassemble, assemble and transport integrally and can be recycled.