The invention provides a terminal state restricted planet type hybrid power system global optimization method, and belongs to the technical field of new energy vehicles. The method comprises the stepsthat before DP backward motion optimization, system boundary calculation is carried out, an dboundary restriction of a state variable of every moment is obtained, so that the boundary restriction isconsidered in the backward iterative optimization process, and electric quantity balance of the system is achieved. By means of a solution of the boundary restriction, no penalty function is needed, and a large amount of debugging work conducted in order to achieve the electric quantity balance is avoided; meanwhile, robustness of an algorithm is no longer affected by model parameters and operation conditions, the amount of calculation and the time cost are lowered, and the efficiency of optimizing the algorithm is significantly improved.