Modified alkadiene polymer as well as preparation method and application thereof

The invention provides a modified alkadiene polymer, a preparation method of the modified alkadiene polymer and application of the modified alkadiene polymer as base rubber. A molecular chain of the modified alkadiene polymer comprises a monovinyl aromatic hydrocarbon structure unit, a conjugated alkadiene structure unit and a silane coupling agent shown in a formula (I), wherein the number-average molecular weight of the modified alkadiene polymer is 50000-1000,000; R1-R4 is C1-C20 linear chain or branched chain alkyl or heteroatom-containing C1-C20 linear chain or branched chain alkyl; the heteroatoms are selected from one or more of halogen, oxygen, sulphur, silicon and phosphorus. The modified alkadiene polymer can be used for effectively balancing the relation between wet-skid resistance and rolling resistance and can also be used for improving unpleasant odor generated by using the silane coupling agent in the rubber mixing process. The formula (I) is as shown in the description.