Provided is a hierarchical modeling method for an electric power simulation system.The method comprises the steps that a bottom-up idea is adopted, and an interaction layer, a control layer, a device layer and a system layer are sequentially designed from the bottom layer to the top layer; based on the hierarchical design, all devices in a hydropower station are classified, the devices with similar functions are abstracted into an element class, device instances are distinguished by configuring different attributes, the requirements of electrical topology analysis and auxiliary machine pipe network topology analysis are considered, a classification method based on the number of element ports is adopted by element objects, the power station devices are divided into a one-port element, a two-port element, a three-port element and a connecting element, further subdivision is conducted according to the number of the element ports and the element functions, a universal model template is established in a unified mode, and the construction and interaction processes of models are described by means of an event trigger mechanism.According to the hierarchical modeling method for the electric power simulation system, not only can the continuous dynamic process of the devices be reflected, but also the discretization control process and the interaction and trigger processes of the models can be shown.