The utility model relates to a synthetic insulator with aerodynamics umbrella shape, which comprises ball socket hardware fittings, round head hardware fittings, and an acid resistant core rod for connecting the ball socket hardware fittings and round head hardware fittings, wherein the acid resistant core rod is covered with umbrella-shaped silicone rubber that is alternatively arranged by sequence of one large umbrella following two small umbrellas, the ratio of spacing interval and protrusion distance of the same type of umbrella is 1 or above, and the protrusion distance difference of the large umbrella and the small umbrella is 15 mm or above. By the above structure, the occupied space difference of the large umbrella and the small umbrella is remarkably increased (i.e. ventilation space is remarkably increased), and the inclined angle of each umbrella and the umbrella spacing interval are limited, so that the self-cleaning ability of the synthetic insulator is remarkably improved, the bridge connection of rainwater or ice slush among umbrellas can be avoided, and the anti-fouling ability is improved.