Vane-type external door lock

The utility model discloses a vane-type external door lock. The vane-type external door lock comprises a lock case, a bottom plate, a spring bolt, a sliding plate, vanes, vane springs and a spring retainer, wherein a key used for controlling the spring bolt to extend or retract from the upper side of the lock case is mounted in a key hole of the lock case; the spring bolt is mounted on the side end of the sliding plate and is able to extend out of the lock case; multiple vanes superposed and matched for locking the sliding plate are arranged on the front side of the sliding plate in the lock case; each vane is provided with a vane spring matched with the vane; all the vanes are connected with the spring retainer fixed in the lock case in a limit manner through the vane springs; the lower side of the sliding plate is fixedly connected with a square pin, and the square pin can be driven by the key in the rotating state to push the sliding plate to move transversely; the bottom plate is used for limiting the movement of the vanes and the sliding plate; a first support nail and a second support nail used for limiting the vanes to slide up and down are mounted on the bottom plate in the longitudinal direction; a longitudinal sliding chute matched with the support nails is formed in each vane; a transverse sliding chute used for matching with the first support nail to limit the transverse sliding of the first support nail on the upper side of the bottom plate is formed in the sliding plate; a square pin concession slot for facilitating the transverse movement of the square pin above the sliding plate is formed in each vane.