The invention provides a nitrile butadiene rubber reinforcement type plasticizer preparation method, which comprises: dissolving a nitrile butadiene rubber in a solvent to prepare a solution, adding an olefin double-decomposition catalyst and a coke-proof rubber reinforcing agent, and carrying out solvent removing on the rubber solution after the reaction so as to obtain the reinforcement type plasticizer product. According to the present invention, with the reinforcement type plasticizer, after the nitrile butadiene rubber is added to the open mill, the Mooney viscosity of the base rubber canbe reduced by 0.5 unit/part, the strength can be increased by more than 0.05 MPa/part, and the scorch time can be delayed by 1-15 s/part.