The invention relates to a method for synthesizing tricyclodecanedimethanol. The method is capable of synthesizing the tricyclodecanedimethanol by virtue of one-step hydroformylation of dicyclopentadiene in the presence of a catalyst, wherein the catalyst is a phosphine ligand modified cobalt-rhodium-copper trimetallic catalyst and prepared by use of a sol-gel method; besides, the catalyst is mainly a supported solid catalyst, and is relatively simple in preparation process, relatively low in catalyst price, relatively mild in reaction condition, high in catalytic activity and reaction selectivity, relatively short in reaction time, convenient to separate from the reaction system, reusable, and convenient for enlarged and industrial application. In the presence of the catalyst obtained by use of the method, the conversion rate of the dicyclopentadiene can be above 99% and the selectivity of the tricyclodecanedimethanol can be above 90%.