Marine safety fixing device with self-locking function

The invention discloses a marine safety fixing device with a self-locking function. The fixing device comprises an upper screw rod, an upper clamping head, a double-end nut, a lower screw rod, a lowerclamping head, a self-locking pipe and a self-locking rod, a clamping ring is installed at the upper end of the upper screw rod, the middle of the upper screw rod is connected with the upper clampinghead in a threaded penetrating mode, and the self-locking pipe is installed at the lower end of the middle of the upper clamping head; the lower end of the upper screw rod is connected with a double-thread nut, the lower end of the double-thread nut is connected with a lower screw rod, a lower clamping head is connected to the middle of the lower screw rod in a threaded penetrating mode, and a self-locking rod is installed in the middle of the lower clamping head through a through hole. The marine safety fixing device with the self-locking function is provided with the self-locking pipe and the self-locking rod, when