Device for preventing mis-rotation and seat

A device for preventing mis-rotation including: a blocking portion; a mount having a bottom wall, a first side wall and a second side wall configured to form an accommodating space; a stopper pivotally arranged between the side walls and at least partially accommodated in the accommodating space to pivot between a locking position in which the stopper is clamped with and stopped at the blocking portion direction and a releasing position in which the stopper and the blocking portion are released; and a pushing assembly arranged on the bottom wall of the mount and at least partially accommodated in the accommodating space, the pushing assembly being capable of sliding on the bottom wall under an action of external force, so as to pivot the stopper from the locking position to the releasing position.