The invention provides a high-definition video double-link hot standby transmission device comprising a transmitter and receiver, which are connected with each other. The transmitter comprises a powersupply conversion module, an input module, an output module, an EDID module and a control unit; the receiver comprises a receiver power supply conversion module, a double-link receiving module, a DVIoutput module and a receiver control unit; the high-definition video double-link hot standby transmission device provided by the invention combines the advantages of a twisted pair and optical fibertransmission, the twisted pair has strong resistance to damage, the confidentiality of the optical fiber transmission is good, no hidden danger of electromagnetic leakage exists, and the transmissiondistance is long; and video signals transmitted by an optical fiber link and a twisted pair link are both lossless high-definition video signals, so that the consistency of display images is ensured.