The invention provides a capacitive voltage divider vacuum drying system and method for a mutual inductor. A capacitive voltage divider to be dried is placed at a dry placement position of a drying space; a drying control module obtains a preset drying temperature threshold value, a pressure threshold value and duration of each step in the drying process in the drying space; a heating mechanism heats the drying space; a vacuum pumping device performs vacuum pumping on the drying space; after the preset drying duration is reached, the drying control module controls the opening of a vacuum breaker valve through a vacuum breaker valve control module, and the outside air enters the drying space through a dehumidifier, so that the drying space is atmospheric pressure. The presence or absence ofdew drops is observed by an observation mirror to determine the drying condition of the capacitive voltage divider. The entire drying process is free of insulating oil, and people and the environmentare not affected; and the drying rate is high, the product treatment effect is good, the temperature of the product drying process is easy to control, and the internal insulation damage of products is not caused.