The invention relates to the technical field PVC resin auxiliaries, in particular to a PVC resin oil-soluble terminator and a preparation method thereof.The PVC resin oil-soluble terminator is prepared from, by weight, 5-50 parts of epoxidized soybean oil, 10-30 parts of an antioxidant, 10-40 parts of bisphenol A, 1-20 parts of a solid terminator, 5-40 parts of a stabilizer, 1-40 parts of a plasticizer, 5-45 parts of styrene, 5-25 parts of solvent oil and 5-40 parts of a methanol solution.The obtained PVC resin oil-soluble terminator is good in termination effect and long in heat stabilization time; solid materials are added into a reaction kettle at a time in the preparation process, reaction time is greatly shortened, the reaction temperature is low, energy consumption is reduced, and the productivity of a production device is improved; no wastewater is generated in the whole production process, the production technology is environmentally friendly, and the equipment requirement of the technology is low; a production system is safe and stable in operation and has good economic benefits.