The invention discloses a preparation method of a 9,11 olefin steroid compound. The preparation method comprises a step of performing reaction on a compound as a raw material shown in a formula I andan organic silicon reagent as well as iodised salt in an organic solvent for 2 to 4 hours at 20 below 0 DEG C to 60 DEG C to obtain the 9,11 olefin steroid compound shown in a formula II, wherein a dashed line indicates a single bond or double bonds; R[1] is F or H; R[2] is OCH3 or OCH2CH3; R[3] is OCH3 or OCH2CH3. The preparation method is simple and has mild conditions, and the 9,11 olefin steroid compound can be prepared in one step. In addition, a yield of the 9,11 olefin steroid compound is up to 90 percent or above; the purity is high, and the problems of long synthetic routes and low yield of a conventional method are avoided, so that the yield is increased, and energy consumption is reduced.