For the existing problems of conventional CO₂ foam fracturing fluid，such as poor compatibility with CO₂，uncontrollable cross-linking，poor temperature and shear resistance，and high residue content，a polymer-CO₂ foam fracturing fluid system was formed using a acrylamide-based copolymer（BCG-8）as thickener，composed of 0.3%—0.6% thickener BCG-8+ 0.2%—0.45% thickening synergist B-55（foaming agent）+0.2%—0.3% regulator B-14+ 1% KCl，and the rheological property，temperature and shear resistance，proppant carrying capability and gel-breaking property of the fracturing fluid was investigated. The results showed that，the system kept higher viscosity at the foam quality of 55%—75%；The viscosity of the fracturing fluid remained more than 30 mPa·s after sheared for 120 min at the shear rate of 170 s^-1 and at the temperature of 140℃，which indicated that the fracturing fluid had higher viscoelastic effect，and resulted in the fracturing fluid had better proppant carrying capacity than that HPG gel had.Moreover，the broken gel fluid had lower surface tension than 24 mN/m and the residue was as low as 0.1 mg/L. With the advantages of smoothly construction，quick effect and obvious simulation effect in the shale gas wells of Yanchang oil，the system had great significance to efficient development and reservoir protection of the unconventional reservoirs.