The invention relates to a semi-hollow bicontinuous line-structure coaxial nanowire material in a H2V3O8/graphene tube, a preparation method and application of the material. The nanowire material is formed by coating a H2V3O8 nanowire by self curling of graphene, a gap is formed between a H2V3O8 nanowire and graphene curl formed by self curling of the graphene, wherein the diameter of the H2V3O8 nanowire is 20-80nm. The nanowire material can be used as a positive electrode active material of a lithium ion battery. The nanowire material has the advantages of simple process, low cost and the like, and the battery formed by the electrode material has the characteristics of good cycling stability, excellent electrochemical performance under high current, and the like.