The invention discloses a driving motor of a closed-loop lens. The driving motor of the closed-loop lens comprises a base, wherein a lens carrier is arranged in the base. The driving motor of the closed-loop lens is characterized in that a PCB is arranged outside the lens carrier, a coil is arranged on the inner side of the PCB, a Hall element is arranged at the center of the coil, yoke iron is arranged on the outer side of the PCB, a magnet is arranged on the side, close to the PCB, of the outer side of the lens carrier, and a shielding cover is arranged outside the base. The operating principle of the driving motor is that the electrified coil generates a magnetic field to interact with a magnetic field generated by the magnet, the lens carrier is pushed to move back and forth, the Hall element at the center of the coil senses the position of the magnet and outputs an electric signal, a control chip receives the electric signal, carries out calculation, and outputs a signal to control the input current of the coil to be changed, and then the lens carrier is controlled to be balanced at a certain position. According to the driving motor of the closed-loop lens, feedback is achieved through the Hall element, and due to the fact that the control chip has memory ability, the reaction speed for adjustment is high.