A facile route for fabricating CO₂ gas stimulated, magnetically recyclable hybrid nanoparticle is designed and illustrated through introducing a CO₂ sensitive polymeric matrix and gold nanoparticles (AuNPs) onto the surface of magnetic Fe₃O₄@SiO₂ nanospheres. The accessibility of the AuNPs to the reaction substrates can be tuned following swollen or collapsed of CO₂ sensitive shell, which may leads to an increase or decrease of catalytic activity. Therefore, the obtained hybrid system offers a novel strategy to adjust and control the catalytic activity through mild stimulation of CO₂/N₂, where the magnetic core assures a magnetically recyclable catalysis.