<p>Disclosed is a pirate prevention device. A pirate prevention device according to an embodiment of the present invention includes a protection member opening and closing a passage by installing a protection door on a deck on one side of the passage of a lower ladder; multiple fixing members fixing the protection door on the deck to be closed by fixing and connecting the protection door and the deck; a winch formed on one side of the bottom of an upper ladder and opening and closing the protection door while being connected to the protection door by a cable; and a roller member installed on the bottom of the upper ladder and turning the direction of the cable.</p>
