The utility model discloses a milling shoe. The milling shoe comprises a milling shoe body with an axis. A first channel into which flushing fluid is guided is arranged in the milling shoe body and penetrates through the milling shoe body in the axis direction. The bottom wall of the milling shoe body is provided with a second channel communicated with the first channel. The second channel stretches in the direction of the side wall of the milling shoe body till penetrating out of the side wall of the milling shoe body. The lower portion of the milling shoe is fixedly connected with a casing milling barrel, and a casing milling head for milling the side wall of a tubular column is arranged at the lower portion of the casing milling barrel. A cement loop on the wall of the tubular column is milled through the structure of the casing milling head, the pressure generated when the upper portion of the tubular column is milled through the milling shoe is reduced, and milling efficiency is improved. In addition, the first channel and the second channel for water injection are arranged in the milling shoe, scrap iron and impurities generated in the milling process can be discharged out to the ground through a circulating system, and the accumulated scrap iron and impurities are prevented from affecting milling of the milling shoe. The whole milling shoe is safe, effective and easy and convenient to operate.