Fence type ship anti-piracy system

The invention discloses a fence type ship anti-piracy system which mainly comprises rotating devices, connectors, mooring ropes and anchor cable machines. When a ship passes through a piracy zone, the rotating devices are connected with the mooring ropes by rotating rings and distributed at sea surface by a front anchor cable machine and a rear anchor cable machine. Under the driving of the ship, the rotating devices move relative to seawater and generate rotation under action of fluid power, paddles underwater generate lateral unbalance force to drive the rotating devices to move towards an outboard direction to drive the mooring ropes to spread for forming a protective fence used for blocking and attacking pirate ships.