The work aims to develop a new type of self-regulating packaging film with both excellent mechanical properties and air permeability for the preservation of red raspberries. With Poly(L-lactic acid) as the substrate, PLLA/PBAT blending packaging film was prepared by melt blending method by adding different proportions of good-flexibility copolymer of butylene adipate and butylene terephthalate (PBAT). Meanwhile, the mechanical properties, air permeability and water vapor permeability of the film were measured, and the preservation effect on red raspberries under 4 ℃ storage conditions was evaluated. When the addition ratio of PBAT was 10% and 30%, the elongation at break of PLLA increased by 87 times and 77 times, respectively and the oxygen transmittance decreased by 19% and 7%, respectively. After the red raspberries packed in different packaging films were stored in cold storage for 7 days, the PLLA/PBAT(10%) blending packaging film could maintain the environment of 5% O2 and 12% CO2 in the packaging bag of red raspberries. On the 7th day of storage, the respiratory intensity was reduced by 27.1% and 18.6% compared with that of PE and CK groups, and the mass loss rate was reduced by 65.8% compared with that of CK group. Thus, the shelf life of red raspberries was extended. The atmospheric environment formed by PLLA/PBAT blending packaging film is conducive to low-temperature storage and preservation of red raspberries. The atmospheric environment of 5% O2 and 12% CO2 inside the packaging can reduce the quality loss of red raspberries. Meanwhile, it can delay the rotting speed of red raspberries and extend the low-temperature preservation period of red raspberries to 7 days.