The invention discloses a high-efficiency heat radiation composite cable. The cable comprises a cable coating layer and a cable core arranged therein, an installation cavity is arranged in the cable coating layer, more than one plastic hose is arranged side by side in the middle of the installation cavity the two ends of each plastic hose are inserted into through holes formed in the two sides ofthe cable coating layer respectively, the outer wall of the insertion end of each plastic hose is adhered and fixed to the inner wall of the through hole via glue, the two ends of each plastic hose are open-mounted, the bottom of each plastic hose is provided with two suction hoses, each suction hose is internally provided with a water sucking channel, a water storage channel is arranged in the plastic hose, and a water storage cavity is formed in the bottom of the installation cavity. The high-efficiency heat radiation composite cable has a very high pressure resistance, and is especially suitable for noisy enclosed factory areas, the cable core can be protected effectively, heat of the cable core is taken away via water stored in the cable, and the transmission stability is ensured.