The invention provides a random generation method for a
physical structure of a catalytic layer of a
proton exchange membrane fuel
cell, which comprises the following steps: firstly, calculating
control parameters, and secondly, generating a carbon
carrier phase, specifically, S21, generating a new carbon sphere; s22, judging whether the new carbon sphere is a growth
nucleus, if not, executing S23, if so, further judging whether the new carbon sphere is overlapped with other carbon spheres, if so, returning to S21, and if not, executing S25; s23, judging whether the new carbon ball coincides with other carbon balls or not, if yes, executing S24, and if not, returning to S21; s24, judging whether the contact ratio of the new carbon ball and other carbon balls is not greater than a predefined allowable maximum contact
ratio value among the carbon balls, if so, executing S25, and if not, returning to S21; s25, confirming the generation of the new carbon spheres, and converting all lattice points in the area occupied by the new carbon spheres into carbon
carrier phase lattice points; s26, checking whether the
volume fraction of the carbon
carrier phase at the moment meets the requirement or not, and if not, repeating S21 to S25; and finally generating a
platinum particle phase and an
electrolyte phase.