The invention discloses an unmanned aerial vehicle imaging-based bridge crack identification device, which comprises a lightning rod, propellers, screw rods, support rods, crossbars, a sealing cover,a numerical control platform, a connecting rod, a camera, a fixed platform, a power system, a navigation system, a communication system, a control system, an imaging system, an auxiliary system, a wireless network, a power supply, an led light, an alarm system, a memory and a voice prompt module. The unmanned aerial vehicle imaging-based bridge crack identification device is additionally providedwith the lightning rod, the device is prevented from being damaged by lightning strike when working in a thunderstorm, thus the operation of the internal power system of the device is not interfered,the combination and assembly of the support rods and the crossbars enables the device more stable in storage, the device runs more smoothly, the air resistance is more even, under the adjustment of the control system and the imaging system, the camera can photograph the bridge in all directions, the communication system and the imaging system transmit signals to a receiving station, and thus simpleness and practicality are achieved.