The invention provides a power grid controls system and method based on source network charge storage. The system comprises a central station control system, a main station control system, a substation control system, an energy-storage power station and a user side; the central station control system calculates the frequency of the power grid, counts the total switchable load amount, and sends a load operation instruction to the main station control system according to change station of the power grid frequency; the main station control system sends a second load operation command to the substation control system according to the first load operation instruction; the substation control system sends a power adjusting command or a third load operation instruction to a terminal according to the second load operation command; the energy-storage power station converts an operation mode of the energy storage power station according to a power adjusting command; and the user side cuts off orrecovers an interruption load according to the third load operation instruction. Adjustment is made in real time according to frequency change of the power grid, stable operation of the power grid iscontrolled in a coordinated way, and problems including equipment overload and section off-life caused by cutting off of a lot of loads can be avoided effectively.