The utility model relates to the technical field of oil field tertiary oil recovery and belongs to a CO2 corrosion-resistant Y443 type packer, which is designed to resolve problems of poor performances of corrosion resistance and air-tight sealing and the like of conventional drillable packers. An upper conical body 5 and a lower conical body 15 of the packer are fixed on a central pipe 1 via shearing pins 6, and the lower end of a lower slip 16 is connected to a piston 18 which is connected to the lower portion of the central pipe 1 via a locking ring 17. The packer is applicable in CO2 injection well environment, and has the advantages of realization of setting and releasing of a multiple-completion packer in one tubing construction, simple and convenient construction technique, short construction period and the like.