The invention provides a composite material rotation structure and a forming method thereof and belongs to the technical field of structural composite material manufacturing. The forming method comprises the steps that a core mould is manufactured, wherein the core mould comprises a cylindrical mould section, a transition mould section and a frustum mould section, the cylindrical mould section isconnected with the frustum mould section through the transition mould section, and the connection position is in smooth transition; the surface of the core mould is coated with a release agent, and then laying layers are laid, wherein the laying layers comprise the first annular laying layer, a first non-annular laying layer and an annular reinforcing layer, the first annular laying layer and theannular reinforcing layer are laid annularly around the core mould, the first annular laying layer covers the cylindrical mould section, the transition mould section and the frustum mould section, theannular reinforcing layer covers the transition mould section, the first non-annular laying layer is laid in the direction from one end of the core mould to the other end of the core mould and coversthe cylindrical mould section, the transition mould section and the frustum mould section; and after laying of the laying layers, curing and demoulding are conducted, and thus the composite materialrotation structure is obtained. According to the composite material rotation body member, the weight of the overall structure is decreased by 15% or above, and the manufacturing production period of the member is shortened by about 10%.