The invention discloses a preparation method for a sulfur, nitrogen and cobalt co-doped carbon material-loaded palladium-copper alloy fuel cell catalyst, and belongs to the technical field of preparation of fuel cell nanocomposite catalysts. The method specifically comprises the steps of preparing a sulfur, nitrogen and cobalt co-doped carbon material carrier, loading a palladium-copper alloy active ingredient on the carrier and the like, and the carrier and the alloy active ingredient have a good synergistic effect. As a carrier of the fuel cell catalyst, a sulfur, nitrogen and cobalt co-doped carbon material is significant for improving the activity of the catalyst; by a transition metal copper, a co-catalytic effect is achieved to improve the activity of a noble meal catalyst, and the using amount of the noble metal catalyst is reduced to reduce the cost of the fuel cell catalyst, so that a broad application prospect is achieved.