The invention relates to a super deep desulfurization combined method for FCC (fluid catalytic cracking) gasoline. The method comprises the steps of (1) with full fraction FCC gasoline and hydrogen as raw materials, enabling the raw materials to contact with protective agents 1 and 2 and a catalyst selectively removing alkadiene in a reactor removing alkadiene under proper conditions so as to remove most alkadiene in full fraction FCC gasoline raw material; (2) after the full fraction FCC gasoline with alkadiene removed in step (1) passes through a gas-liquid separator, dividing the liquid entering a fractionating tower into a light gasoline fraction and a heavy gasoline fraction; (3) enabling the heavy gasoline fraction obtained in step (2) to contact with the catalyst in a selective hydrogen desulfurization reactor under proper operation condition; (4) mixing the light gasoline fraction obtained in step (2) with the heavy gasoline fraction subjected to selective hydrogen desulfurization in step (3), then mixing with new hydrogen, and enabling the mixture to contact with an adsorbent in an adsorbing super deep desulfurization reactor under proper condition so as to remove most sulphur in the gasoline to obtain the ultra low sulphur gasoline product with content of sulphur less than 10ppmw.