In order to eliminate line overload and node overvoltage in N-1 accident, an optimal static security correction control algorithm based on source-load coordination is proposed in this paper. Aiming at the static security correction measures of adjusting generator output and cutting off load, the static security correction control cost of power grid is analyzed. On the premise of satisfying the static security constraints of power grid, the static security correction control model of power grid is established with the objective of minimizing the overall control cost of the system. Considering the discrete characteristics of controllable load, a load-shedding control strategy table is formed according to the order of load-shedding cost from small to large. The load-shedding strategy is selected from the load-shedding strategy table by using sensitivity index. The cost of each load-shedding strategy is analyzed, and the static safety correction control model is coordinated to solve the generator unit output under the minimum load-shedding strategy. The case study shows that the discrete load-shedding strategy is feasible for load-shedding schemes, avoiding the problem of too little and too much load-shedding. The source-load cooperative static security correction control can effectively eliminate the node overvoltage and line overload in the N-1 accident with the minimum control cost. This work is supported by National Key Research and Development Program of China (No. 2018YFB0904800).