The present invention discloses an air-injection type tool for scrubbing off the dirt on a body including: an air-retaining body 2 formed of an elastic material expandable in an air-injection manner, the air-retaining body 2 having a scrubbing towel 40 encompassed on the external surface thereof; a disc-like support body 4 disposed at the inside of the air-retaining body 2 and having a cylindrical coupling protrusion 6 formed at the top central portion thereof, the cylindrical coupling protrusion 6 having a piston A reciprocated therein such that the air generated by the reciprocating motion of the piston A is sent to the air-retaining body 2; and a cover body 12 adapted to be pressurized by a handle 18 screw-coupled with the coupling protrusion 6 of the support body 4 thus to come into close contact with the support body 4 such that the air-retaining body 2 is kept airtight.