Supporting device of deep hole boring cutter bar

The utility model discloses a supporting device of a deep hole boring cutter bar. The supporting device of the deep hole boring cutter bar comprises a boring cutter bar, an annular supporting structure and a guide strip, and the annular supporting structure is arranged around the side wall of the boring cutter bar; a plurality of guide strips are arranged on the outer wall of the annular supporting structure and protrude out of the outer wall of the annular supporting structure. According to the utility model, the annular support structure is sleeved on the boring cutter rod, during boring, the boring cutter rod rotates, the boring cutter at the front end of the boring cutter rod processes the inner wall of a hole, and the plurality of guide strips on the annular support structure are propped against the inner wall of the processed hole, so that radial support force is provided for the boring cutter rod, and the boring cutter rod is prevented from being bent due to stress; the guide strips protrude out of the