This appliance slew by the hydraulic, and launch the boat to the water surface by the boat own gravity, slew the boat or raft outboard under the condition of loss of electricity. while launching, the passengers could pull the remote-control cable in the boat to launch or stop rescue boat or raft. As well, the crews can operate it on the deck. This appliance meets the SOLAS 1974, the international life-saving appliance rules LSA and IMO, MSC.81(70) and other regulatory requirements. The crane is driven by the hydraulic winch, and adjusts the working radius by the cylinder to the suitable position to lower the goods.