The invention provides a power dynamic simulation screen controller based on an ethernet network. The power dynamic simulation screen controller comprises a power supply, an ethernet interface, an ethernet controller, an MCU and an RS485 communication interface, wherein the power supply is respectively connected with the ethernet controller, the MCU and the RS485 communication interface, and is used for providing electricity; the MCU is connected with the ethernet interface through the ethernet controller; and the output end of the MCU is used for outputting a signal through the RS485 communication interface. The power dynamic simulation screen controller is capable of obtaining equipment state data from a communication machine port of a transformer substation for analyzing and deleting through the ethernet network, then controlling an electric parameter and an on-off state of an electric simulation screen through a data bus, and updating the operation state to achieve the target of dynamic simulation; intelligent monitoring can be met; the automatic degree is improved; and dynamic updating of the operation state of the transformer substation is achieved, so that a dispatcher can accurately carry out scheduling arrangement; and the production schedule and the equipment safety are ensured.