Reducing type continuous windowing tool for buried hill stratum

The utility model relates to the technical field of buried hill stratum sidetracking well casing windowing, in particular to a reducing type continuous windowing tool for a buried hill stratum. The body of the tool is columnar, a spherical face is arranged on the head of the body, YD5-8 particle hard alloy welding rods are welded to the spherical face in an overlaid mode, the diameter of the rear segment of the body is larger than that of the front segment of the body, the rear segment and the front segment of the body are in transitional connection, a plurality pieces of YG8 rectangular block hard alloy are welded to the outer surfaces of the front segment, the transition segment and the rear segment of the body in an equal-angle mode, and a plurality of pieces of YG8 octagonal prism hard alloy are welded to the outer surfaces of the front segment, the transition segment and the rear segment of the body in an equal-angle mode. Ancient buried hill high-abrasiveness granite hard formation casing windowing is achieved, the effect of completing pilot hole drilling and chambering at a time is achieved, work efficiency is improved by three times to five times, cutting capacity is high, footage drilling is fast, buried hill stratum windowing work can be independently completed through the single tool, and the high tensile strength and torsional strength are achieved through the integrated structural design.