The invention provides an automatic tooth-pulling operation chair. The automatic tooth-pulling operation chair comprises a first mechanical arm, a second mechanical arm, two chair legs, a platform, a backrest, two first servo motors, two racks, a hinged support, two second servo motors, two second servo motor bases, a rack ring, two first gears, two first rack ring bases and a third servo motor. The automatic tooth-pulling operation chair is characterized in that the upper portions of the two chair legs are installed at the lower portion of the platform separately, and keep parallel; the lower end part of the backrest is hinged to the end part of the platform through the hinged support, and the two first servo motors are installed at the left hinging portion and the right hinging portion respectively. According to the automatic tooth-pulling operation chair, by arranging the racks on the platform, partial gear ring can be freely moved front and back on the platform, and the distance is adjusted; a supporting frame of the first mechanical arm is utilized to support the oral cavity, and thus the second mechanical arm has the space to complete tooth-pulling work.