Slender hole notch machining tool and machining method

The invention provides a slender hole notch machining cutter and method, the cutter comprises a core shaft, an extension rod and a cutter holder which are connected in sequence, the extension rod with the proper length is arranged to penetrate through a slender hole to be machined, a blade is installed and adjusted through the cutter holder, and the extension rod is clamped and fixed on a main shaft through supporting of the core shaft. In addition, the extending height of the blade is adjustable, a channel capable of ventilating is formed in the long and thin hole notch machining tool, ventilating and cooling can be achieved, chippings can be discharged in time, blocking interference is avoided, and in the cutting process, the chippings can be removed in time, so that the machining efficiency is improved. And every time reciprocating cutting in the axial direction is executed, the height of the tool nose is adjusted by adding a thin gasket below the blade, so that the purpose of adjusting the cutting depth i