Herein, we reported a facile method for fabricating nanoflower-like Co3O4 catalysts via calcination treatment based on ZIF-67. The catalytic performances of the obtained Co3O4 catalysts were evaluated for the model reaction of CO oxidation. The results demonstrated that calcination temperature had a strong effect on the structure and catalytic reaction activity of Co3O4 catalyst. Co3O4 catalyst prepared at 400 A degrees C (Co3O4-400) exhibited the optimum catalytic activity with a complete CO conversion temperature of 105 A degrees C. This phenomenon was ascribed to the higher specific surface areas, smaller particle size, unique structure, good low-temperature reduction and higher abundances of surface Co2+ and adsorbed oxygen species. The addition of 1.0% water vapor had a negative effect on CO oxidation and the prepared Co3O4-400 catalyst presented long-term stability.