The invention discloses a nonmetal all-dielectric jetnet micro-cable surface detection apparatus. The apparatus comprises a frame and a box body arranged on the frame, an inner cavity is arranged in the box body, the inner cavity is divided into two parts, the inner cavity can be opened or closed, the internal of the inner cavity is a channel for a cable to traverse through, the inlet and the outlet of the channel are provided with two groups of LED light sources, every group of the LED light sources comprises a plurality of LED lamps, and the LED lamps surround the inner cavity; and the outer side of the inner cavity is provided with at least four cameras, the cameras are fixedly arranged on the box body through camera connecting pieces, the inner cavity is provided with camera holes matching with the cameras, and the cameras shoot the surface condition of the cable traversing through the inner cavity through the camera holes. The cable defect detection device allows an allowable destroy threshold to be set, reflects the condition of the whole cable in real time, alarms and records the defects of the cable in order to provide convenience for subsequent processing, can seek the source, and is highly-efficient and safe.