Closed underwater vehicle rescue system

The invention provides a closed underwater vehicle rescue system, and the system is used for establishing direct communication between a deep diving lifeboat and a wrecked underwater vehicle, shortening the communication time in the submarine rescue process and improving the rescue efficiency. The closed underwater vehicle rescue system comprises a rescue ship and an emergency buoy; the emergencybuoy is provided with a full duplex underwater acoustic communication machine, a heterogeneous signal processor and a water surface wireless communication module. The heterogeneous signal processor isused for receiving a wireless communication signal sent by a rescue ship, converting the wireless communication signal, forwarding the converted wireless communication signal to the full-duplex underwater acoustic communication machine, and sending the converted wireless communication signal to underwater acoustic communication equipment carried by a wrecked underwater vehicle by the full-duplexunderwater acoustic communi