The utility model discloses a multi-layer inner thermal insulation quilt, comprising multiple base films, with bubble films arranged between adjacent base films. The bubble films are bonded to the base films on both sides longitudinally and transversely to form air bubbles, with a single bubble bonding distance of 0cm–3cm × 0cm–3cm. Adjacent base films form air interlayers via the bubbles. Two-layer or three-layer quilts serve as basic units for various combinations, or four-layer, five-layer and thicker inner thermal insulation quilts can be directly manufactured. Beneficial effects: the utility model reduces the surface area of the bubble layer and enhances thermal insulation; suitable air interlayer distances can be selected to reduce the thickness of double-layer, triple-layer and multi-layer quilts for easier transportation; it is also more convenient for production, use and storage.

Country Code: CN

Application Number: CN201721615336.4