Abstract: In view of the current wire crimping process and quality detection method with low accuracy and weak feature resolution, traditional flaw detection technology is constrained by the volume of the equipment, the applicability of carbon fibre conductors and steel-cored aluminium stranded wires,an overhead line with Xray live non-destructive testing（NDT） system based on unmanned aerial vehicle（UAV） was developed. The formation mechanism of various defects in the service process of crimp fittings was analyzed, and a state evaluation system for key equipment was established. On this basis, a UAV X-ray live NDT detection model was proposed.Using remote sensing image acquisition technology realized flaw detection image acquisition, gaussian filtering and noise reduction processing was performed on the collected remote sensing images of overhead live wire clips. Based on the edge detection image segmentation algorithm, the fault detection image of the noise reduction output was divided into fault defects so as to achieve accurate defect identification and fault location. The experimental results show that the developed UAV live NDT system has strong capacity for damage detection with active vibration reduction and electromagnetic protection features which plays a significant role in operating fine management of the entity of overhead line and fault location of the auxiliary equipment.