The invention discloses an inner-cavity core tyre for prefabricating a hollow concrete structure. The inner-cavity core tyre comprises a core tyre, wherein the core tyre is formed by connecting a plurality of core-tyre units, an inflating/deflating component is arranged on the core tyre, a finished piece which is made of a flexible material is adopted as each core-tyre unit, a through reinforcer-placing hole is arranged in each core-tyre unit, every two core-tyre units are communicated through a gas-guiding pipe or an intersegmental joint, a plurality of groups of reinforcer-placing holes are arranged into spatially-staggered layout, a reinforcer with both ends extending out of each reinforcer-placing hole is arranged in the reinforcer-placing hole, and a positioning mechanism is arranged on the core type. According to the invention, the core tyre which is made of the flexible material is creatively selected as an inner-cavity mould for producing the hollow concrete structure, the structure is simple and reliable, expensive metal materials are saved, the effect for reinforcing the connection of both sides can be realized, the technical difficult problem that a structure which can penetrate through the core tyre and has direct and effective effects can not be selected when the hollow concrete structure is prefabricated in the industry is solved, and the integrality, the strength and the anti-seismic performance of the inner-cavity core tyre are improved.