The disclosure discloses a receiving end/signal transmitting method, a pure-optical active cable and an active cable. The receiving end includes a first high-speed signal optoelectronic transmission module and a first low-speed signal optoelectronic transmission module; a power supply port of the first high-speed signal optoelectronic transmission module being connected with a high-speed signal line of the receiving end, and a power supply port of the first low-speed signal optoelectronic transmission module being connected with the high-speed signal line. When the high-speed signal line of the receiving end is connected to a termination power supply of a display device during signal transmitting, the first high-speed signal optoelectronic transmission module and the first low-speed signal optoelectronic transmission module are capable of acquiring a power supply signal from the high-speed signal line to solve power supply in the receiving end of the pure-optical active cable.