The invention discloses a fixed core clamping tool for processing a wheel hub. The fixed core clamping tool comprises fixed core seats, a fixed core base, a clamping jaw, a spring seat, a supporting flat pad block, a square base, a chuck panel, a chuck pulling disk and a chuck base; the fixed core seats are welded on the fixed core base, and the fixed core base is fixed on the spring seat internally provided with a spring through a bolt; the spring seat is fixed on the chuck panel through the bolt, all fixed core bases are uniformly and radially arranged on the fixed core base with reference to the central axis of the spring seat as the center; the fixed core seats contact with the inside of the front wheel edge of the wheel hub and fix the wheel hub on a fixed core plane; the chuck panel is connected with the square base for placing the wheel hub, and the supporting flat pad block is arranged on the square base and used for supporting the front wheel edge of the wheel hub in the state that the clamping jaw is downwards pulled; and the wheel hub is positioned on the fixed core plane. The fixed core clamping tool has the advantages of convenience for operation, reasonable design and good generality; three points of the wheel edge are centered, the fixed core is automatically corrected, thus ensuring the fixed core to be accurate and enabling the clamping to be quick; in addition, an empty-avoiding structure can effectively avoid the collision of the wheel hub.