The invention discloses a machining machine tool rotation table which comprises a main body, a stator, a rotor, a harmonic reducer, an output part, a clamping device, a sensor, a supporting bearing, an angle encoder, a first seal part and a second seal part. The stator is fixed to the main body, the harmonic reducer comprises a flexible wheel, a rigid wheel and an inner bearing, the flexible wheelis meshed with the rigid wheel, the rotor comprises a matching portion, and two ends of the first seal part abut against the main body and the rotor respectively. The output part is accommodated in the clamping device in a matched mode, a clamping force of the clamping device is greater than a moment produced during cutting, and a cutting torque is prevented from acting on a gear to influence thetransmission and rotation precision, so that the rotation precision is higher. The stator produces an alternating magnetic field to make the rotor rotate after being electrified, the rotor rotates tomake the harmonic reducer operate, the harmonic reducer is matched with the rotor in transmission, the whole size of the rotation table is greatly decreased on the premise that the cutting torque ismet, the machining and assembling costs are saved, and the machining precision is improved.