The invention provides a method for preparing a solution polymerized rubber/white carbon black composite material with molecular chain containing an epoxidized functional group. The solution polymerized rubber/white carbon black composite material is prepared by performing a chemical reaction of the epoxidized functional group and hydroxyl on the surface of white carbon black. The solution polymerized rubber/white carbon black composite material is prepared by performing the chemical reaction of the functional group and hydroxyl on the surface of white carbon black. The method provides high function group content of the solution polymerized styrene butadiene rubber, can greatly reduce the agglomeration of a polymer in white carbon black, and reduce the phase separation of the polymer and white carbon black from a molecular level, at the same time, the strong interacting effect of white carbon black and a polymer matrix is enhanced, so that the comprehensive performance of the material is effectively improved. During the preparation method of the composite material, traditional heavy mixing equipment during rubber processing is not required, and high energy consumption and mixed reinforcing treatment are reduced.