A new thermal-latent hydrosilylation catalyst consisting of H2PtCl6 and polymers bearing amine moieties is described. In the presence of aminated polymers, the catalytic activity of H2PtCl6 was suppressed remarkably in the model reaction of triethylsilane with trimethylvinylsilane, whose effect was remarkably higher in comparison with monomeric amines. On heating, however, sufficient catalytic activity was attained where the activation temperature was dependent on the amine content in the polymer and polymer structure. Furthermore, this catalyst system was applied to the curing process of silicone resin to confirm the thermal-latent character of the catalyst.