The invention discloses a transformer body oil leakage area detection system and method. The system is characterized by comprising a monitored transformer, a transformer oil leakage area detector, a display screen, a power socket, a communication and USB port, operation keys, an operation interface, an oil leakage area, a single-point fluorescence excitation source, an annular fluorescence excitation source, a rotating sleeve, a fluorescence detector, a high-precision movement controller, a main control panel and a stepping motor. According to the system, whether leakage oil of the transformerbody is rapidly judged and the oil leakage area is calculated. According to the system, the principle that the ultraviolet light beam irradiates to the leakage oil area of the transformer body and then excites the oil surface fluorescence imaging is adopted, so that the leakage oil insulation problem of equipment can be rapidly and accurately detected in real time.