The invention discloses an advanced control of the grid-connected power of a new energy power station, and belongs to the field of power system operation and control. The method comprises the steps: generating a power grid operation mode at a to-be-controlled moment according to the load prediction of the to-be-controlled moment, an external call wire plan, a hydroelectric generating set power generation plan, an equipment maintenance plan and new energy power station power generation prediction, and estimating the safety and stability margin of the power grid and the cost performance of the control performances of the power station/set; carrying out the grouping through combining with a prediction adjustment performance index of the new energy power station; increasing a power station/setwith the negative cost performance for power generation if the safety stability margin of one fracture surface is less than a warning threshold value, and reducing the power station/set with the positive cost performance for power generation for power generation; or else increasing the new energy power station for power generation, and reducing the hydroelectric generating set for power generation. The method irons out the fluctuation of new energy, gives consideration to the safe and stable operation of the power grid and the maximum acceptance of new energy, and provides a new beneficial idea for the grid-connected control of the new energy.