Cathode catalyst for metal-air battery and manufacturing method thereof capable of improving battery life

A manufacturing method of cathode catalyst for metal-air battery comprises the steps of: performing a low-temperature hydrothermal reaction to a carbon source suspension and a metal source solution at 70 DEG C to 85 DEG C for at least 20 hours to obtain a first product including a first precursor; performing a high-temperature hydrothermal reaction to the first product and a nitrogen source solution at 180 DEG C for at least 12 hours to form a second precursor; and performing heat treatment to the second precursor at 200 DEG C to 900 DEG C in a protective atmosphere to make the second precursor undergo a phase transition to obtain a cathode catalyst for the metal-air battery. The carbon source suspension includes inorganic carbon sources. The metal source solution has a pH range of 6.5 to 10.5 and includes metal sources formed from soluble ionic compounds. The nitrogen source solution includes nitrogen sources formed from nitrogen-containing organic compounds. The present invention further provides a cathode