A reciprocating abrasive flow polishing machine, including the body, the first hydraulic cylinder, the first push rod and the first cylinder, the reciprocating abrasive flow polishing machine, is provided with four placing cylinder, and placed inside the cylinder is provided with a limited block, and the limit block and the inner wall of the cylinder is installed between the elastic spring, while the limit block is installed on the outer surface of the ball, In this way, the pipe workpiece of different diameters can be placed in a limit, to ensure the stability of the workpiece processing, improve the processing progress of the workpiece.