Reinforced sheath for power grid safe cross spanning

The utility model discloses a reinforced sheath for power grid safe cross spanning. The sheath is composed of a protection pipe and a protection cap. The protection pipe is composed of an insulating layer and a heat shrink material anti-aging layer covered thereon. The two ends of the protection pipe expand, and the caliber of each end is 1.2 times greater than the caliber of the central portion of the pipe, such that rain water is effectively protected from flowing backward into the protection pipe and a lead is prevented from erosion by rain water. The pipe end of the protection pipe is provided with internal screw threads. The protection cap is a U-shaped end cap made from soft resin material. A wire inlet seam is disposed on the end cap. After a lead is clamped, the two ends of the protection pipe are covered. The tail of the end cap is provided with screw threads that are mated with the internal screw threads of the pipe end. The end cap is tightly cooperated with the protection pipe. A lead hole is arra