The invention provides a large-scale power grid flow correction equation parallel solving method. According to the characteristic of a factor table solving linear equation operation process and the sparsity of a flow correction equation coefficient matrix, rows which can be normalized at the same time are grouped, parallel normalization operation and elimination operation are completed. Row grouping information acquired in a factor table solving process, parallel former generation operation is completed. The efficiency of large-scale power grid flow solving is improved. The flow calculation real-time requirement of flow, security analysis, AVC and other online analysis applications of a power grid dispatcher can be met. The dispatcher can find potential risks of power grid operation soon, so as to ensure safe and stable operation of a power grid.