Metal catalyst and mass production preparation method thereof and fuel cell

The invention discloses a metal catalyst and a mass production preparation method and application thereof. The mass production preparation method of the metal catalyst comprises the following steps: mixing a metal precursor salt of the metal catalyst, a carrier and a reducing solvent in a protective atmosphere to obtain a mixture solvent; carrying out pyrolysis reduction reaction on the mixture solvent in a plurality of temperature intervals to generate a metal catalyst, wherein the temperatures of the plurality of temperature intervals are increased from low to high in a gradient manner, andthe mixture solvent is dynamically heated from the low-temperature interval to the high-temperature interval to carry out the pyrolysis reduction reaction. According to the mass production preparationmethod, the generated metal particles are uniformly dispersed and supported on the carrier, and the metal particles are uniform in particle size and have high catalytic activity. Besides, the processconditions of the mass pro