Disclosed is an intelligent lightning protection on-line monitoring and early warning device. According to the intelligent lightning protection on-line monitoring and early warning device, a lightning waveform reproduction technology is adopted, and real reproduction of lightning which is visible and impalpable energy is achieved through information acquisition of a rogowski coil and a lightning positioning system and specific logical operation; the intelligent lightning protection on-line monitoring and early warning device is novel in structure and high in anti-jamming capacity, can intelligently analyze data acquired by the device and uploaded data, and can achieve early warning of direct lightning, prejudgment of lightning, and early warning and alarms of faults and hidden danger; the purposes that before lightning strokes happen, effective early warning is conducted, whether a lightning device has a fault or not is judged, intervention and pre-arranged planning are conducted in advance, and the unnecessary loss and damage are reduced are achieved; the purposes that when the lightning strokes happen, lightning stroke data are recorded, and whether the lightning protection measure is effective or not is judged through monitoring are achieved; after the lightning strokes end, the damaged positions are provided, and damage cause data are output; the solid foundation is laid for targeted research and adjustment of the lightning protection measure in future.