Underwater long-distance tunnel signal local transmission system

The utility model provides an underwater long-distance tunnel signal local transmission system. The underwater long-distance tunnel signal local transmission system comprises an AUV body, a plurality of signal transmission carriers, a signal transmission parent body, an overwater control platform and a working ship, the overwater control platform is arranged on the working ship, and the signal transmission parent body is connected with the overwater control platform through an umbilical cable; the AUV body is provided with a mechanical claw and is used for carrying signal transmission carriers into an underwater tunnel, and the signal transmission carriers are sequentially arranged in the extending direction of the underwater tunnel at intervals; the AUV body, the signal transmission carrier and the signal transmission matrix are respectively provided with a signal receiving module and a signal transmitting module; the AUV body is an underwater robot without a cable, and the signal transmission matrix is an u