The invention discloses a carbon/carbon composite material laminated coating and a preparation method thereof. The laminated coating is sequentially composed of a SiC under layer, a SiC transition layer and an alternative layer of SiC layer/ceramic layer on a base body of the carbon/carbon composite material. According to the preparation method of the carbon/carbon composite material laminated coating, a preparation method of the SiC under layer is realized by brush coating, spray coating or magnetron sputtering. A preparation method of the SiC transition layer and the alternative layer of SiC layer/ceramic layer sequentially comprises the following steps: ultrasonically cleaning the carbon/carbon composite material with the SiC under layer through acetone, and drying the material; cleaning the material through ion source sputtering; and preparing the SiC transition layer and the alternative layer of SiC layer/ceramic layer through magnetron sputtering. The prepared laminated coating disclosed by the invention has excellent oxidation resistance and thermal shock resistance at 1500 DEG C. The preparation method disclosed by the invention has a characteristic of being able to control thickness, and the prepared coating is good in thickness uniformity.