The invention discloses a free-form surface structure form creation method considering load uncertainty. The method is simple and effective in algorithm, and the problem that the robustness and reliability of a free-form surface structure cannot be guaranteed due to neglect of the load uncertainty in the form creation process is solved. The rigidity and robustness of the uncertainty optimized free-form surface structure are far better than those of an initial structure, and the stress performance is better; and when the size of the load is unchanged and the direction is uncertain, the robustness and reliability of the uncertainty optimization structure are far better than those of the deterministic optimization structure.