Cylindrical shell inner wall machining device

The invention discloses a machining device for the inner wall of a cylindrical shell. The device comprises a cutter supporting rod fixed on a machine tool; the central axis of the cutter supporting rod is parallel to the axial direction of the machine tool; the cylindrical shell is arranged outside the cutter supporting rod in a sleeving mode through the hoop tool unit, and the hoop tool unit is arranged on the moving unit in a radial moving mode. In this way, the cylindrical shell moves longitudinally, so that the cylindrical shell and the cutter supporting rod are coaxial; the moving unit is arranged on the machine tool in an axial moving mode. Therefore, the whole inner wall of the cylindrical shell is machined. The hoop tool unit comprises a hoop belt used for fixing the cylindrical shell. Therefore, after the cylindrical shell and the cutter supporting rod are coaxial, the cylindrical shell is fixed and does not shake any more, and the machining precision of the inner wall is not affected. A cutter mount