Gear shaft machining clamp

The utility model discloses a gear shaft processing clamp, which relates to the technical field of clamp equipment and comprises a base, a support frame arranged on the base, a clamping piece arranged on the support frame, a driving screw arranged in the support frame, a first helical gear arranged on the driving screw, driven screws arranged on two sides of the driving screw, and a second helical gear arranged on the driven screws. A second bevel gear is arranged at one end of each driven screw rod, moving parts are arranged on each driven screw rod and the driving screw rod, and the moving parts are fixedly connected with the clamping parts in a one-to-one correspondence mode; a gear shaft is supported through a supporting frame, a driving screw rod is rotated to drive a first bevel gear to rotate, so that two second bevel gears meshed with the first bevel gear rotate, driven screw rods are driven to rotate, and moving parts move synchronously; and therefore, the gear shafts of different sizes placed on the