The invention relates to an online hardware closed-loop network source coordination linear active-disturbance-rejection control method, and the method comprises the steps: taking LABVIEW as a development environment, and building a coordination control algorithm library comprising the LADRC (linear active disturbance rejection control); taking an NI Compact RIO controller as a carrier, replacing a conventional PID control module through the LADRC based on the coordination control algorithm library, and building a network source coordination LADRC strategy which takes an energy balance signal as a feedforward signal. The method employs the LADRC to replace a conventional PID control module, can achieve a purpose of no static error through an ESO expanded observer of the LADRC through an integration element, avoids the side effect of integral feedback, does not depend on a specific mathematic model of a controlled system, is stronger in capability of resisting internal and external interferences, improves the adaptability and disturbance resistance of a network source coordination control strategy of an internal source side of an ultra-high voltage grid, enables the whole system to be good in robustness and adaptability in a network source coordination work section, is simple, and is more convenient for engineering application.