The disclosure provides an anti-fuse device including an anti-fuse unit and a sensing circuit. The anti-fuse unit includes a first anti-fuse and a second anti-fuse serially connected between a first terminal of the anti-fuse unit and a second terminal of the anti-fuse unit. The sensing circuit is coupled to the first terminal and the second terminal of the anti-fuse unit for sensing a blown state of the anti-fuse unit.