The invention relates to a closed-loop lens driving device. The driving device comprises a pedestal, a lens seat for bearing a lens, a coil wound around the lens seat, magnets arranged in the periphery of the coil, a circuit board fixed on the pedestal and an induction element fixed on the circuit board and positioned in parallel with the optical axis. According to the invention, the circuit board of the pedestal of the driving device is provided with the induction element, and the induction element can be used to detect the weakness of a magnetic field and the electrification amount of the coil generated after electrification of the detection coil and further to determine the position of the lens accurately; and compared with a traditional manner, the horizontal size of a camera is reduced, and the wring difficulty is reduced.