Air pressure expansion self-adaptive chamfering and deburring pneumatic tool

The invention relates to the technical field of hole machining, in particular to an air pressure expansion self-adaption chamfering and deburring pneumatic tool which comprises a supporting main shaft, an air inflation device, a rotation device, an elastic air bag and an elastic abrasive belt. A hollow inner cavity is formed in the supporting main shaft in the axis direction, the supporting main shaft communicates with the inflation device, the elastic abrasive belt is arranged on the periphery of the elastic air bag, the two ends of the elastic abrasive belt and the two ends of the elastic air bag are fixed to the supporting main shaft, and a plurality of vent holes communicating with the inner space of the elastic air bag are formed in the supporting main shaft. A limiting ring used for limiting the expansion size of the elastic abrasive belt and the elastic air bag is arranged on the periphery of the elastic air bag, and the diameter of the limiting ring is smaller than that of the to-be-machined through h