Blocking device restricting wing movement

The utility model relates to a locking element for restricting movements of wings, which comprises an axial length fixed or adjustable rod unit with the width similar to the wings, wherein one end or two ends of the rod unit is equipped with a fastener capable of fixing the frames of the wings. The locking element uses the straight rod unit and the fastener installed at the end portion of the rod unit to restrict the movements of the wings. Only when the rod unit is broken down can open the wings from outside. Thereby the locking element has the advantages of extremely simple structure, low cost and extremely good safety.