The utility model belongs to the technical field of instrument calibration equipment technique and specifically relates to an integrated form transformer capacity calibration equipment, the arc rainbow generator comprises a casing, install a simulation transformer in the casing, should simulate and install a display screen in the casing of transformer side, the simulation transformer is built -in to have a transformer module, and the display screen is built -in to have a display module, this transformer module and display module respectively with the casing in the central processing unit module of installing be connected, install a current sensor and a voltage sensor in the casing, this current sensor and voltage sensor's signal output part is connected with central processing module through an adc, and this central processing module is connected with a data storage module, and this data storage module is connected with a RS323 converter, install the terminal in the casing, this terminal is connected with outside three -phase AC power supply.