The objective of the invention is to provide a cable projection injury detection device. The objective of the invention is to solve the technical problem of injury projection detection of an outer surface of a cable. The cable projection injury detection device comprises a control system, and a detection length regulation system, a detection parallelism regulation system and a cable flatness detection system which are electrically connected with the control system. The detection length regulation system arranged in the device provided by the invention can achieve detection of cables of different lengths; the detection parallelism regulation system can achieve that cable clamping mechanisms at two ends clamp two ends of the cable at the same height so as to ensure the measurement accuracy of the cable flatness detection system for the to-be-measured cable; and the cable flatness detection system can perform detection in different directions of the surface of the cable so as to ensure the detection of the projection faults of the surface of the cable.