Small-diameter side hole deburring device

The utility model belongs to the technical field of part production assistance, and particularly relates to a deburring device for a small-diameter side hole. Comprising a supporting sleeve rod, an air cylinder, a plurality of steel balls and a push rod, the supporting sleeve rod is hollow, a cylinder body of the air cylinder is fixed to one end of the supporting sleeve rod, a telescopic rod of the air cylinder is fixedly connected with the push rod, and the push rod reciprocates along the hollow interior of the supporting sleeve rod under the action of the air cylinder; a plurality of round through holes are annularly formed in the side wall of the end, away from the air cylinder, of the supporting sleeve rod, a steel ball is embedded in each round through hole, each steel ball is pushed by the push rod to move in the corresponding round through hole in the radial direction of the supporting sleeve rod, and when the steel balls move to outlets in the outer sides of the round through holes, part of the steel