Porous MnCo2O4.5 was prepared by the self-sacrificial template method. That is, the precursor with a plate-like morphology was firstly synthesized via a hydrothermal method, using MnSO4 and CoSO4 as raw materials and H2C2O4 as precipitator, respectively. Then porous MnCo2O4.5 well preserved the plate-like morphology, was in situ obtained by calcining the precursor. X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and N2 adsorption-desorption were used to characterize the phases, morphologies and pore structures of the samples. Differential scanning calorimetry (DSC) was employed to evaluate the catalytic performance of these porous MnCo2O4.5 microsplates for thermal decomposition of ammonium perchlorate (AP). The result shows that the as-obtained porous MnCo2O4.5 exhibites excellent catalytic performance. Adding 2% (wt) porous MnCo2O4.5 into AP decreases the high-temperature exothermic peak by 128 癈 and the apparent decomposition heat increases by 557 J/g, respectively.