Provided is an automatic balance adjustable rotor for a centrifuge apparatus which enables to detect a weight unbalance between samples installed to buckets of the rotor, allows the rotor lever to move horizontally by the detection result, and distribute the remaining eccentric unbalance weight by a back lash during the rotation of the rotor. The rotor of the present invention comprises: a rotor lever (100) which ends are configured for supporting buckets in which samples are installed, wherein a block worm gear (104) is installed at the center of the top surface of the rotor lever; a rotor body (110) for supporting and allowing the rotor lever to horizontally move; a lever movement motor (180) installed in the rotor body; and a power transmission means (200) for transmitting a rotational force of the lever movement motor to the block worm gear, allowing the rotor lever to horizontally move.