The intelligent on-load capacity adjustment transformer has two capacity gears, large and small, which can automatically adjust the capacity operation without power failure according to the change of load. When the load is light or close to no-load, the transformer is adjusted from large capacity to small capacity operation, which not only greatly reduces the no-load loss, but also overcomes the trouble of manual operation of power failure for no-load capacity adjustment, and truly achieves the purpose of energy saving and intelligence. This product is especially suitable for rural power grids with large seasonal load changes, residential areas with significant day and night load changes, street lamp changes, urban commercial areas, part-time industrial areas and oil field pumping unit distribution changes, and is also suitable for 35kV power transformers with large load changes. The intelligent on-load capacity adjusting transformer developed by our company has a number of patents, which is mainly composed of transformer, on-load capacity adjusting switch and control box with on-load capacity adjusting controller installed. Its functions of data storage, remote signaling, remote control, remote adjustment, telemetry, intelligent networking, reactive power compensation control, anti-theft, etc. are unmatched by traditional energy-saving products such as coil iron core and amorphous transformer.