The invention discloses an unmanned aerial vehicle high-definition wireless relay system. The system comprises a signal acquisition end, a wireless relay installed on the unmanned aerial vehicle and wirelessly connected with the signal acquisition end; and a receiving terminal wirelessly connected with the wireless relay. The unmanned aerial vehicle high-definition wireless relay system realizes the relay forwarding of the high-definition single video at the front end, effectively avoids the shielding, and guarantees that the whole link from the front end to the relay to the center is in a visual range status, and expands the valid distance of the video transmission; and the system can fast and accurately perform the deployment without being influenced by the field complex environment.