The utility model relates to a rust -resistant protection field of reinforcing bar, a rust -resistant protective sheath in novel steel bar end of circulated use promptly in worker china democratic national construction association and the hydraulic engineering work progress. It includes that one section diameter is greater than the PVC sleeve that receives the protection bar diameter, a sleeve pipe end band blind end. The axial interval is followed to the sleeve pipe surface has two, three or two above convex epireliefs. Union body before the sleeve pipe front end has one section, preceding union body open end hole have along axial, interval two relative recesses. The sleeve pipe diameter is than the big 6 -8mm of bar diameter, length 10cm. Adopt the PPR sleeve pipe, site operation operation construction is simple and convenient, constitute simple, easy on -the -spot the realization, light weight, high strength, collision resistance, resistant high temperature corrosion, can circulate use repeatedly, long service life. The reinforcing bar tip connects the protective sheath has enough length, reduces and exposes the part, avoids the corrosion, collides with, and it influences not receive in the work progress operation personnel to make a round trip external force such as walking, material are had bad luck, the concrete vibrates.