Metal card holder detection device

The invention discloses a metal card holder detection device which comprises a detection module and a magnet, wherein the detection module comprises a detection unit, an indicating unit and a magneticswitch; the detection unit is electrically connected with the indicating unit through the magnetic switch; when the magnetic switch is in an open state or closed state, the indicating unit gives different indication information; the magnet can slide; the magnet and the magnetic switch are arranged oppositely, and a certain distance is reserved between the magnet and the magnetic switch; if a metal card holder is arranged in a card slot during detection, the metal card holder attracts the magnet to slide to approach the magnetic switch, then the magnetic switch is closed, and the indicating unit gives the indication information that a metal card holder exists; and if no metal card holder is arranged in the card slot, the magnet does not slide and keeps static, the magnetic switch is open,and the indicating unit gi