The utility model discloses an auto -lock ribbon, tapered end and lock area including linking to each other are equipped with the through -hole on the tapered end, the through -hole is taken the entrance point of one end and is close to the exit end that one end was taken to the lock including lock dorsad, are equipped with one end and tapered end fixed connection's installation pole in the through -hole, are equipped with and install the pole on the installation pole and rotate the ratchet of being connected, be equipped with in the through -hole with tapered end fixed connection's fixed column, the cover is equipped with the movable block on the fixed column, lies in the movable block on the fixed column and is equipped with the spring towards through -hole inner wall one side, the movable block is equipped with the pawl dorsad on one side of the spring. Cooperation through ratchet and pawl makes the ratchet be merely able to remove to the direction of entrance point in the positionwith the pawl butt. , lock area passes through ratchet one side of pawl dorsad like this after penetrating from the entrance point for the lock area can be rotated by the ratchet, then can lock deadlywhen the antiport is taken to the lock. Because the ratchet can not rotate along the opposite direction in the vibration yet, it takes precautions against earthquakes consequently can to play avoidsthe lock to take the condition of deviating from.