The invention discloses a model real-time maintaining method of a power grid regulation and control model center. The method includes the steps of classifying models on the levels of model objects andmodel object properties, establishing a model maintaining authority management method with a plant station as the granularity, completing the maintaining authority judgment through model service of the model center to realize distributed source end maintaining of the models within the jurisdiction range of the model center, establishing the consistency commit mechanism between the model center and an access subsystem, and coordinating the public model commit state between the model center and the access subsystem to realize the real-time maintaining of the models of the model center and the access subsystem. The distributed type source end maintaining requirements of the subsystem models are met, the maintaining complexity of the model center models is reduced, the updating timelines andexpandability of the model center models are improved, the strong consistency of power grid models of an all-stage access model center system is ensured, and bottom level model data support is provided for various subsequent online and offline applications at the model center.