The invention provides an auxiliary device for adjusting head positions in head and neck surgery. The auxiliary device comprises a base. A groove is formed in one end of the base. A neck support is arranged in the groove. A rotating shaft penetrates through the center of the neck support. A head rack is arranged at the outer side of the neck support. A connecting block is arranged at the bottom of the head rack. A connecting shaft is arranged on the connecting block. One end of the connecting shaft is connected with the connecting block, and the other end of the connecting shaft is connected with the neck support. The auxiliary device is further provided with a control system. The control system comprises positive and negative pole change-over switches, a speed adjusting button, a first motor, a second motor, a speed adjusting chip and a transformation speed changer. An output shaft of the first motor is connected with the connecting shaft. An output shaft of the second motor is connected with the rotating shaft. The positive and negative pole change-over switches comprise a first positive and negative pole change-over switch and a second positive and negative pole change-over switch. The first motor is connected with the speed adjusting chip through the first positive and negative pole change-over switch. The second motor is connected with the speed adjusting chip through the second positive and negative pole change-over switch. The speed adjusting button and the transformation speed changer are connected with the speed adjusting chip. A power line is led out of the transformation speed changer. By means of the auxiliary device, the upper, lower, left and right positions of the head of a patient can be adjusted.