Polished pipe protection cap with positioning end

A polished pipe protection cap with a polishing end is used for protecting the end of petroleum casing pipe and various pipes. The polished pipe protection cap comprises a cap body which comprises an upper segment, a middle segment and a lower segment; wherein the diameters of the upper segment, the middle segment and the lower segment reduces gradually in segment. An outer wall of the cap body is provided with annular blades. An upper segment of the cap body is provided with a crown and constitutes the positioning end together with the upper segment of the cap body. The crown end is outwards overturned. Furthermore a transition platform is formed between the crown end and the upper segment of the cap body. The width of the transition platform is same with the thickness of the protected pipe. The internal diameters of the upper segment of the cap body and the protected pipe are same. The polished pipe protection cap with the polishing end is advantageous in that: because of the special design for the protection cap end, positioning for the crown and the upper segment of the cap body is realized for ensuring no matching eccentricity between the crown and a pipe-end bevel.