The invention belongs to the technical field of chemical synthesis and particularly discloses a platinum-based hydrosilylation catalyst capable of being stably stored and a preparation method of the platinum-based hydrosilylation catalyst. The catalyst is prepared by forming a metal platinum-organic complex through reaction of a platinum-based compound and a double bond-containing organic siloxane ligand and then adding a certain amount of novel organic compound, wherein the novel organic compound is the compound with the structure shown in a formula I, n is 4-10 in the formula, and R is a paraffin chain of which the carbon atom number is 1-17. By the platinum-based hydrosilylation catalyst capable of being stably stored, the problems that an existing platinum-based hydrosilylation catalyst is unstable to store and easily reacts with metal ions and other active compounds to lose the catalytic activity are solved.