The invention relates to a partitioning solving method for the linear simultaneous equations of the dynamic simulation of a power system. The partitioning solving method comprises the following steps: (1) partitioning a simulation sparse matrix; (2) decomposing the notation of a diagonal matrix; (3) decomposing the numerical value LU (Lower Upper) of the diagonal matrix; and (4) according to the partitioned matrices, performing forward and backward substitution to solve the linear simultaneous equations. The partitioning solving method provided by the invention effectively utilizes the characteristic of the sparse matrix of large-scale linear simultaneous equations in the simulation, greatly shortens the time of the whole dynamic simulation of the power system under the premise of guaranteeing the correct result and the simulation precision, improves the computing efficiency of solving the linear simultaneous equations, and overcomes the defect that a frequently-used non-partitioning solving method is low in efficiency and can not make full use of the structural characteristic of a to-be-solved matrix.