The invention discloses a cylindrical coordinate type automatic feeding and discharge mechanical hand. The cylindrical coordinate type automatic feeding and discharge mechanical hand comprises a sucking disc type mechanical arm mechanism, a horizontal motion mechanism which drives the mechanical hand to horizontally move, a rotating mechanism which drives the mechanical hand to rotate, a lifting mechanism which drives the mechanical hand to rise and fall, and a box body used for placing the mechanical hand. According to the cylindrical coordinate type automatic feeding and discharge mechanicalhand, an alternating current servo motor is adopted as a power source, horizontal motion and rising motion of the mechanical hand are achieved through a ball screw nut transmission mechanism, and rotating motion of the mechanical hand is achieved through a gear pair composed of a driving gear and a rotary disc bearing; the lifting mechanism adopts a synchronous belt mechanism and a screw nut mechanism and has an accurate transmission rate, and good working precision of the mechanical hand can be maintained; the sucking disc type mechanical arm mechanism can accurately and stably adsorb plateworkpieces and transfer the workpieces to be processed through cooperation of lifting motion, rotating motion and horizontal motion; and operation is simple, and labor intensity of workers is greatlyreduced.