The invention provides a current transformer detection system and method. The system comprises a lifting device disposed on the upper surface of a power cabinet, and a U-shaped holding clamp fixed at an end part of the lifting device. A side surface of the U-shaped holding clamp is provided with a radar distance-measuring sensor. The interior of the power cabinet is provided with a control device, and the radar distance-measuring sensor is electrically connected with the control device. The lifting device consists of a plurality of hydraulic rods. The control device comprises an upper computer, a lower computer, a large-current output module connected with the upper computer, and a hydraulic movement module which is connected with the lower computer. The large-current output module comprises an electronic voltage regulator, a high-frequency filter, and a current increasing device. Through one-key control, the device completes the high-altitude wire connection or disconnection, replaces an original combination of a high-altitude wiring clamp and a large-current generator, can complete the one-time connection and point polarity operation of the current transformer, works in a mode of a working vehicle, reduces the labor intensity of a worker, and improves the work efficiency.