The invention discloses a distribution network planning scheme security evaluation method simulating an optimal control process, comprising the following steps: 1, extracting parameters of the distribution network planning scheme; 2, carrying out power flow calculation in the process of not applying control to the system, and dividing an adjustment time period for the adjustable equipment whose operation times are limited in the system; 3, enumerating part of the running states of the adjustable equipment, decoupling the system to form a plurality of subsystems, and generating a combination table for the running state combination and the time period of each subsystem; 4, by simulating the optimal control process, analyzing the feasibility of the running state combination at each moment inthe combination table, and calculating the system performance under each combination; and 5, synthetically matching the feasible combinations of the whole time period, and judging whether the best combination sequence can be selected. If the best combination sequence can be selected, the security is reliable; otherwise, the security is unreliable. The invention fully considers the equipment type and controllability in the distribution network.