High-rust-proof casing pipe for full-slewing drilling machine

The utility model discloses a highly rust-proof casing pipe for a full slewing drilling machine, which comprises a pipe body, connecting pipes are inserted on both sides of the top of the pipe body, an air inlet pipe is inserted at the top end of one connecting pipe, an air outlet pipe is inserted at the top end of the other connecting pipe, a plurality of first heating pipes are inserted between the two connecting pipes, and a plurality of second heating pipes are inserted between the two connecting pipes. A second heating pipe is inserted between every two first heating pipes, a plurality of cutters are inserted at the bottom of the pipe body, a first wear-resistant coating is arranged on the circumferential outer wall of the pipe body, a second wear-resistant coating is arranged on the circumferential inner wall of the pipe body, and a plurality of fixing plates are fixedly connected to the bottom of the pipe body; and a plurality of fixing bolts are inserted between every two fixing plates and the cutter