The invention discloses a dicyclic hydrocarbon-substituted silane compound. The dicyclic hydrocarbon-substituted silane compound has a structure shown in the following general formula, and in the general formula, n is 0 or 1, R1 and R2 represent the same or different C1-C6 straight chain or branched chain alkyl and R3 represents C1-C6 straight chain or branched chain alkyl, C3-C7 cycloalkyl or dicyclic[1,1,1]pentane. The dicyclic hydrocarbon-substituted silane compound can cooperate with a titanium-containing solid Z-N catalyst so that high catalysis activity is obtained. High-isotacticity polypropylene can be prepared from the dicyclic hydrocarbon-substituted silane compound.