The invention discloses an optimization planning method for a grid structure of an alternating current/direct current hybrid microgrid. The optimization planning method comprises the steps of obtaining the basic data of the alternating current/direct current hybrid microgrid, wherein the basic data comprises a power supply output model, a load probability model and environment data; sampling the output of the power supply output model and the load probability model based on the environment data through a latin hypercube sampling method to obtain a sample matrix; establishing an optimization model of the grid structure of the alternating current/direct current hybrid microgrid, wherein the optimization model comprises target conditions and constraint conditions; solving the optimization model based on the sampling matrix to obtain multiple optimal solutions and the target condition values corresponding to the target conditions of each optimal solution; and choosing the target optimal solution from the multiple optimal solutions according to the target condition values, wherein the grid structure corresponding to the target optimal solution is the optimal grid structure. Therefore, the optimization planning for the grid structure of the alternating current/direct current hybrid microgrid is realized consequently.