Preparation method of fuel cell catalyst, fuel cell catalyst and fuel cell

The application provides a preparation method of a fuel cell catalyst; the method comprises the following steps: dissolving a template agent, an initiator and a nitrogen-containing polymer precursor in an aqueous solution to obtain a first mixture, dispersing the first mixture in a solution containing a rare earth metal precursor and an alkali metal salt, and performing stirring and adsorbing to obtain a second mixture, calcining the second mixture for 0.2-5 h at the temperature of 600-1000 DEG C, obtaining a sintered product, and enabling the sintered product to be subjected to vacuum drying to obtain the fuel cell catalyst. According to the prepared fuel cell catalyst, the high-entropy rare earth monatomic catalyst is prepared through organic polymerization and high-temperature calcination, the obtained catalyst has the advantages of small diameter, small aperture, high porosity, good fiber uniformity and the like, has good ORR catalytic performance, and can be widely applied to fuel cells and metal-air cel