Rotary grinding and back gouging device for inner wall in limited space and method of rotary grinding and back gouging device

The invention discloses a rotary grinding and back gouging device and method for the inner wall of a limited space, and the device comprises a carrying base which comprises a rotating table capable of rotating in the circumferential direction of the center of the carrying base; the adjustable supporting components are arranged around the outer side wall of the carrying base and detachably connected with the outer side wall of the carrying base so that the carrying base can be supported in the limited space; the connecting plate is detachably connected with the rotating table; and the cross-shaped sliding table is provided with a grinding device and is detachably connected with the connecting plate, the grinding device is used for back gouging of the inner wall weld joint in the limited space, and the cross-shaped sliding table is arranged in the direction perpendicular to the rotating direction of the rotating table so that the grinding device can grind and back gouging in all directions in the limited space.