The invention provides a preparation method of a PtRu/C catalyst, and belongs to the field of catalyst preparation methods. The method comprises the following steps: dispersing a carbon carrier in water to obtain a first suspension; adding a chloroplatinic acid solution and a ruthenium chloride solution to the first suspension to obtain a second suspension; and pouring the second suspension into a sodium borohydride solution, and stirring at room temperature to obtain the PtRu/C catalyst. The invention also provides the PtRu/C catalyst. The PtRu/C catalyst has the characteristics of small particle size, uniform dispersion, and good methanol electrooxidation reaction catalysis performance. Experiments show that when the capacity of the PtRu/C catalyst prepared through the method is 30wt%, the mass activity of the catalyst in a methanol solution with sulfuric acid as an electrolyte reaches 447mA/mg, and is 1 time higher than the mass activity of commercial PtRu/C catalysts.