The invention relates to a piston machining tool. The piston machining tool comprises a tool inner bin, springs, rotating bearings, a conveying plate, an operating plate and a fixed base. A motor is installed at the upper middle end of the outer side of the tool inner bin, piston rods are arranged at the bottom end of the motor, the springs are inlaid in the top ends of the inner sides of the piston rods, and ion fans are fixed to the left and right sides of the piston rods. The rotating bearings are arranged at one ends of the ion fans, one ends of the rotating bearings are provided with fanfixing folding frames, the fan fixing folding frames are connected with the tool inner bin through connecting screws, and an alignment separation plate is installed at the lower ends of the fan fixingfolding frames. The conveying plate is fixed below the alignment separation plate, and transmission wheels are connected with the left and right ends of the conveying plate. The piston machining toolhas the beneficial effects that due to the arrangement of the piston rods, the piston machining tool can carry out high-efficiency machining work; and meanwhile the piston rods have a certain extending and contracting function so that working staff can carry out certain height adjustment of the piston rods.