The invention discloses a charging supporting structure. The structure comprises a core mold (1), a supporting rod (2), an inner cylinder (3), a fastening device (4) and a supporting plate (5). The core mold (1) comprises multiple fan rings, a circular ring shape is formed by the fan rings, the core mold is used for supporting a soft interlayer of an outer engine, the supporting rod (2) is used for supporting the core mold (1), the inner cylinder (3) is connected with an outer structure to position and guide the core mold (1), the fastening device (4) is used for connecting the supporting rod(2) and the inner cylinder (3), and the supporting plate (5) is connected with the seal head end of the outer engine and meanwhile provides supporting force for the inner cylinder (3) and the supporting rod (2). Through the structure, association of the opening diameter and the whole size of the supporting structure does not need to be considered, the opening diameter size of the engine is reduced, charging can be more effective, the higher filling ratio is achieved, and the whole design of the engine is facilitated.